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[Evolution of language: attempt at synthesis].

There are at least three traits that distinguish modern Homo sapiens from his closest relatives: bipedal locomotion, the unusual size of his brain and the ability to use symbolic language. To this day the emergence and evolution of these traits have not been explained sufficiently. New research in anthropology, linguistics, cognitive science and other disciplines shows, that the evolution of the human language faculty is a complex field that was influenced by a wide variety of factors. This paper tries to show the width of these factors and to work out the demands that are to be met by a theory of language evolution. After the introduction, in Section 2 the evolutionary principles and their role in the evolution of symbolic communication will be reviewed. Section 3 gives an overview of the results and controversies of brain evolution research, while Section 4 introduces our current knowledge of the neuronal basis of language. In Section 5 the controversies that had the greatest impact on the field and development of ways to solve them are reviewed before Section 6 summarizes the most important preadaptations for the evolving language faculty.

Animals↗

Structure activity relationship by NMR and by computer: a comparative study.

There has recently been considerable interest in using NMR spectroscopy to identify ligand binding sites of macromolecules. In particular, a modular approach has been put forward by Fesik et al. (Shuker, S. B.; Hajduk, P. J.; Meadows, R. P.; Fesik, S. W. Science 1996, 274, 1531-1534) in which small ligands that bind to a particular target are identified in a first round of screening and subsequently linked together to form ligands of higher affinity. Similar strategies have also been proposed for in silico drug design, where the binding sites of small chemical groups are identified, and complete ligands are subsequently assembled from different groups that have favorable interactions with the macromolecular target. In this paper, we compare experimental and computational results on a selected target (FKBP12). The binding sites of three small ligands ((2S)1-acetylprolinemethylester, 1-formylpiperidine, 1-piperidinecarboxamide) in FKBP12 were identified independently by NMR and by computational methods. The subsequent comparison of the experimental and computational data showed that the computational method identified and ranked favorably ligand positions that satisfy the experimental NOE constraints.

Binding Sites↗

Habitual snoring, intermittent hypoxia, and impaired behavior in primary school children.

OBJECTIVES: Sleep-disordered breathing is associated with impaired behavior and poor academic performance in children. We aimed to determine the extent of behavioral problems in snoring children, clarify the role of intermittent hypoxia, and test the reversibility of impaired behavior and poor academic performance. METHODS: In 1144 children, habitual snoring (HS; snoring frequently or always) and impaired behavior were assessed using parental questionnaires. Intermittent hypoxia (ie, presence of > or =5 arterial oxygen desaturations by > or =4% or > or =1 desaturation to < or =90%) was investigated with pulse oximetry. Poor academic performance (grade 4-6 on a 6-point scale in mathematics, science, or spelling) was based on the last school report. HS, impaired behavior, and academic performance were reevaluated after 1 year. Adjusted odds ratios (ORs) were calculated using unconditional logistic regression. RESULTS: HS was significantly associated with hyperactive (OR: 2.4) and inattentive behavior (OR: 4.0), daytime tiredness (OR: 7.1), and sleepiness (OR: 2.6-4.8). These associations were independent of intermittent hypoxia. HS was also significantly associated with bad conduct (OR: 2.8), emotional symptoms (OR: 5.5), and peer problems (OR: 9.7). At follow-up, hyperactive and inattentive behavior but not academic success had significantly improved in children in whom HS had ceased. CONCLUSIONS: We suggest that impaired behavior is a key feature of HS independent of intermittent hypoxia and improves when HS ceases.

Affective Symptoms↗

Death, dying and informatics: misrepresenting religion on MedLine.

BACKGROUND: The globalization of medical science carries for doctors worldwide a correlative duty to deepen their understanding of patients' cultural contexts and religious backgrounds, in order to satisfy each as a unique individual. To become better informed, practitioners may turn to MedLine, but it is unclear whether the information found there is an accurate representation of culture and religion. To test MedLine's representation of this field, we chose the topic of death and dying in the three major monotheistic religions. METHODS: We searched MedLine using PubMed in order to retrieve and thematically analyze full-length scholarly journal papers or case reports dealing with religious traditions and end-of-life care. Our search consisted of a string of words that included the most common denominations of the three religions, the standard heading terms used by the National Reference Center for Bioethics Literature (NRCBL), and the Medical Subject Headings (MeSH) used by the National Library of Medicine. Eligible articles were limited to English-language papers with an abstract. RESULTS: We found that while a bibliographic search in MedLine on this topic produced instant results and some valuable literature, the aggregate reflected a selection bias. American writers were over-represented given the global prevalence of these religious traditions. Denominationally affiliated authors predominated in representing the Christian traditions. The Islamic tradition was under-represented. CONCLUSION: MedLine's capability to identify the most current, reliable and accurate information about purely scientific topics should not be assumed to be the same case when considering the interface of religion, culture and end-of-life care.

Christianity↗

Development of novel cancer chemopreventive agents in Europe--neglected Cinderella or rising phoenix? A critical commentary. ESF Workshop on Cancer Chemoprevention, DKFZ, Heidelberg, September 18-20, 2005.

Agents that prevent cancer, delay its onset, or revert premalignant conditions could have dramatic beneficial impacts on human health. Although there is an urgent need to develop cancer chemopreventive agents, researchers in the field suspect that this area of scientific endeavour in Europe leads a Cinderella existence, both in terms of perception of importance and research funding. In order to review current activities in this prevention field and to seek a consensus position, an exploratory workshop was held in September 2005 at the German Cancer Research Center (DKFZ) in Heidelberg, Germany, sponsored mainly by the European Science Foundation (ESF), and also supported by the European Association for Cancer Research (EACR) and the German Cancer Society (DKG). The 35 experts from European countries and the United States of America assessed state-of-the-art cancer chemoprevention research in Europe. The aims that the workshop organizers had pre-defined were: i) assessment of the usefulness of animal models for agent identification; ii) review of ongoing preclinical and clinical work on novel agents; iii) discussion of potential biomarkers predictive for cancer preventive efficacy; and finally iv) the potential role that European pharmaceutical industries could play in furthering chemopreventive agent development. Overall the workshop aimed at raising awareness among European clinical and laboratory researchers of the importance of the development of novel, efficacious and safe cancer preventive agents.

Antineoplastic Agents↗

FMRI evidence for a three-stage model of deductive reasoning.

Deductive reasoning is fundamental to science, human culture, and the solution of problems in daily life. It starts with premises and yields a logically necessary conclusion that is not explicit in the premises. Here we investigated the neurocognitive processes underlying logical thinking with event-related functional magnetic resonance imaging. We specifically focused on three temporally separable phases: (1) the premise processing phase, (2) the premise integration phase, and (3) the validation phase in which reasoners decide whether a conclusion logically follows from the premises. We found distinct patterns of cortical activity during these phases, with initial temporo-occipital activation shifting to the prefrontal cortex and then to the parietal cortex during the reasoning process. Activity in these latter regions was specific to reasoning, as it was significantly decreased during matched working memory problems with identical premises and equal working memory load.

Adult↗

Hereditary influences on cognitive functioning in older men. A study of 4000 twin pairs.

OBJECTIVE: To determine the contribution of genetic factors to cognitive functioning in older men. DESIGN: Cognitive testing by telephone interview in an epidemiologically defined population. PARTICIPANTS: 2077 monozygotic and 2225 dizygotic male twin pairs, all between the ages of 62 and 73 years, recruited from the National Academy of Sciences twin registry. MAIN OUTCOME MEASURES: The Telephone Interview for Cognitive Status--Modified total score and factor scores were analyzed. The Falconer heritability statistic and maximum likelihood estimates of genetic and environmental components were computed. RESULTS: Heritability of the total Telephone Interview for Cognitive Status--Modified score was estimated to be 30%. Shared environmental effects accounted for an additional 18% of the variance; most of this was related to years of education. Of the four cognitive factors derived, the language/attention factor had the highest heritability estimate. CONCLUSIONS: Genetic factors and educational achievement together account for almost half of the variance in the cognitive functioning of older men. Studies of the genetics of dementing illnesses need to consider the degree to which cognitive capacities are themselves under genetic control.

Aged↗

What sort of a thing is a religion? A view from object-relations theory.

This paper suggests that a religion is not, as Freud proposed, a science-like thing, refutable by evidence. It is a socially constructed and maintained system of internal objects, analogous to those spoken of in psychoanalysis. Like analytic internal objects, religious objects have a heuristic function but no material existence. Unlike analytic objects, they are derived from a definite cultural tradition and are elaborated over time to meet the experience of practitioners. They may be understood to have a function of 'containing' the feelings, thoughts and fantasies arising in individual practitioners, and of making these experiences comprehensible. These objects then enable the believer to speak more truthfully of, and relate more fully to, the larger matrix within which the human world is situated. Finally, the suggestion is made that, as with analytic internal objects, religious objects may best be judged by their long-term effects on the lives of believers.

Buddhism↗

[The origin of informed consent].

The principle of informed consent, aimed at the lawfulness of health assistance, tends to reflect the concept of autonomy and of decisional autodetermination of the person requiring and requesting medical and/or surgical interventions. This legal formula, over the last few years, has gained not only considerable space but also importance in the doctrinal elaboration and approaches, as well as juridical interpretations, thereby influencing the everyday activities of the medical profession. Informed consent is still the object of continuous explorations, not only asfar as concerns the already confirmed theoretical profile but, instead, the ambiguous practical and consequential aspect. Analysing how the concept and role of consensus was born and developed with the more adequate and reasonable excursions to make it valid and obtain it, it is impossible not to take into consideration, on the one hand, the very ancient philosophical origins and, on the other, the fact that it was conditioned by religion with the moral aspects and the accelerated deontological evolution with pathways parallel to the needs and the progress offered by new forms of treatment and novel biotechnological applications. The principle of consent is a relatively new condition. In fact, already in the times of not only the Egyptian civilisation, but also the Greek and Roman, documents have been found which show how the doctor's intervention had, in some way, first to be approved by the patient. Plato (law IV) had already foreseen the problems, the procedures and the modes of information which are, in synthesis, at the root of the principles of the present formula of informed consent and correlated the practice of the information and consensus with the quality and social position of the patient. The only guarantee that the patient might have, derived from a fundamental principle of medicine of all times: "in disease, focus on two aims, to improve and not to cause damage". A figure can be recognised, in the Hippocratic physician, that cared about the patient's suffering, but never neglected looking after his own outcome, endeavouring to avoid becoming involved in lack of success and death of a patient. The concept of consensus is inexistent, albeit, there is an awareness of the presence of precautious and preventive information. In the behaviour of doctors, in ancient times, it is not difficult to recognize the true motives and the real reasons that, already in those days, give rise to the necessary "defensive medicine" particularly as far as concerns the social status of the patient. Already from the early origins, continuing the Hippocratic tradition, the relationship between doctor and patient was consolidated, based upon two very definite criteria, represented, on the one hand, by the professional duty of the physician to do what is bestfor the patient and, on the other, the duty of the patient to completely accept the physician's decisions and intervention. The Hippocratic physician respected a principle of professional responsibility which was more religious and of a moral type, but, from a legal point of view, very weak inasmuch as it depended upon regulations elaborated by human beings. The conviction and certainty that the physician acted, in the interest of his patient's well-being, has been passed down over the centuries endowing the physician with moral authority and a kind of legal impunity, conditions which corresponded, in an almost reflection-likefashion, with the duty of obedience and subjection, on the part of the patient. Christianity was grafted into this consolidated vision of the sacral character of medicine and medical practice, which did not substantially change the Hippocratic type of ethical behaviour. Non only the population but also the Christian physician was aware of the religious importance of his intense activity as a mission and compared to a special kind of priesthood in safe-guarding health, considered as a gift of God. Therefore, invested with this authority which derived from his professional role and from his very work, he felt it his duty to guide the patient, deciding and for him. The patient is an ignorant person who does not have the knowledge, the intellectual capacity or moral authority to oppose or disagree with the wishes and decisions of the physician who, instead, on account of his doctrine, knows exactly what is goodfor him. In this regard, if we were to speak of consensus concerning the physician's intervention, he would be considered useless in as much as obvious and understood when seeking help. The attitude of the patient towards the physician has always tended to one of strong faith and characterized by psychological subjection borne out by traditions thousands of years old. A patient who was sick, again, as an attitude of respect and gratitude, followed the treatment but never asked for any explanations regarding the therapeutic effects and the physician refrained from taking any initiative to inform the patient or his/her family. Each phenomenon, therefore, has a precise origin, a well-defined history and when its importance tends to significantly condition the activities concerning Man, a desire emerges to learn the origin and the history. As is well known, a trial commenced in Nuremberg, on December 19, 1946, of Nazi doctors and a code was defined in which the judges, all Americans, clearly emphasized a view of medical research and technology: science should never transform or consider human beings as an instrument to be employed for scientific purposes. In actual fact, documents exist providing evidence that a few decades before the drawing up of the Nuremberg Code, the need had been expressed, in Germany itself to somehow make medical interventions and actions legal by means of the use and practice of consensus. The moral and ethical principles in those documents, even if not available as bibliographic references in the English literature, certainly merit, from a historical viewpoint to be considered as conceptual elements and doctrinal and socio-cultural products, even if at that time, of little practical importance, which belong to the European culture and, in particular, and almost paradoxically, in the light of what happened, to the German culture. The United States of America is held to be the country of origin of informed consent, the initial aim of which was make sure that the correct dignity of the patient's independence be reserved at the time of decision making and choice of medical options. Reports on this topic, in fact, first appeared in the USA, at the beginning of the 18th Century, with problems focusing on and limited to only the simple rights of the patient in giving his/her approval of the health intervention later to be conceptually developed, along the lines of an itinerary with, at intervals, famous legal actions, until in the 20th Century, informed consent was reached, a criterion that, as is well known, foresees and includes not only the important and fundamental autonomy of the patient to decide, which stems ones personal rights, but also the essential objective element, which is, information. The expression informed consent has simply been transposed in Italian and roughly translated in an ambiguous fashion into "consenso informato" when, on the contrary, it should be referred to as "informazione per il consenso" "information for consensus" not only to respect the concept but, surely, for a more correct deciphering and a more precise interpretation related to the numerous concepts it presupposes and implies. Information and consent may be compared to the two sides of the same coin. These are the two important pillars that coincide and are joined giving weight to the medical responsibility, as far as concerns consent to the health intervention: on the one hand, having obtained consent,following correct and sincere information interpreted and deciphered as an important phase and an essential indicator of correct, scrupulous medico-professional procedure and, on the other, the consensus itself conceived as a duty aiming at the maximum respect of the rights to autodetermination, independence and autonomy of the patient, as a person. At the beginning of the Nineties, as we have seen, we were made aware of a series of legal actions regarding medical responsibility which was greatly conditioned by the Anglosaxon influence which initially induced many Italian magistrates and forensic physicians to adopt an extremely rigid attitude with no attempt to comply, in any way, with the culture and traditions of our country and our tradition which has always been inspired by good common sense, both medical and human. The American experience has been very rapidly adopted, by some, without a profound, complete and necessary historical and evolutional analysis aimed at those intertwined principles that have been motifs that have gradually led to the legal references in those emblematic cases referred to, the conclusions of which continue to attract a great deal of attention. In Italy, the legal and doctrinal evolution of informed consent, even if following a little more rapidly the traces, steps, problems and interpretations of the various aspects drawn up, characterized and applied in the United States, has not only occurred at a later time, but, despite reaching the same meaningful objectives, the same considerations, the same importance, and, unfortunately, the same inconveniences, has had quite different aims, approaches and articulations. In this respect, it is enough to focus attention on the different cultural traditions and religious routes, on the different doctrinal background, the particular historical origins and the individual legal aspects, all extremely different one from the other. (ABSTRACT TRUNCATED)

Christianity↗

Knowledge accessibility, achievement goals, and memory strategy maintenance.

BACKGROUND: An important aim of educational psychology is to account for the difficulties in cognitive strategy maintenance. Possible explanations may be found in developmental studies concerning the interdependence of knowledge accessibility and strategy use, and in current achievement goal models which assume that individuals with a learning goal use deeper strategies than those with a performance goal. AIMS: The purpose of this study was to examine how knowledge accessibility and achievement goals separately or conjointly affect the maintenance of a categorization strategy, recall performance, and perception of the strategy (utility, difficulty, effort) in a free recall task. SAMPLE: Participants were 93 first-year students from a human science university in France. METHOD: In the first phase, the students were taught how to use a categorization strategy in a recall task involving highly accessible (typical) items. In a subsequent transfer task, the same students were assigned to one of four experimental conditions where they were asked to recall a typical or atypical list and where a learning or performance goal was induced. RESULTS: Analysis showed that whatever the typicality of the list, a learning goal promoted maintenance of the categorization strategy, and of perception of its utility. Performance goal participants only maintained this strategy and its perceptions on typical lists, while on atypical lists they display less clustering and found the strategy less useful. CONCLUSION: Results suggest that maintenance of a cognitive strategy is facilitated when there is compatibility between a performance goal and the task demands, or when the participants are learning-goal oriented.

Achievement↗

[But what future for our students?].

Since June 1, 2002, only those dental practitioners holding a specific professional title are entitled to independent practice. Those practitioners are the General Dentists, the Orthodontists and the Periodontists who have had additional vocational training of one, four, or three years respectively, after completion of their study programme leading to a Licentiate in Dental Sciences (Transition measures allowed practising dentists and students who were enrolled in a training program prior to June 1, 2002 to obtain one of these titles). This regulation includes provisions to limit access to the profession for graduates holding a degree delivered by a university in the Flemish community (84 per year) or the French Community (56 per year). In the French Community, the implementation of a Numerus Clausus (limitation of numbers admitted) at the end of the first study cycle allowed for a limitation of the number of students admitted to the second cycle, and as a consequence it limited the number of candidates enrolling in vocational training in order to obtain a specific professional title. The non-compliance with - and later the cancellation of - this limitation resulted in the number of candidates seeking a specific professional title to be larger than the numbers in the quotas imposed by the Federal State.

Belgium↗

High fertility of Old Colony Mennonites in Mexico.

Old Colony Mennonites in Mexico appear to demonstrate natural fertility, using no form of artificial birth control and apparently not attempting to limit family size. The resulting fertility is nearly as high as that of the Hutterites, although the Mennonites lack the communal economic system of the latter. Most Mennonites in Mexico migrated from Canada in the 1920s, and the largest single settlement, called the Manitoba Colony, is one of four in the state of Chihuahua. A 1967 partial census obtained data from 38% of the Mennonite households. Family size in the sample was close to that in a local survey taken in the same year. Available church records matched with census forms permitted verification of and corrections to 560 female reproductive histories. The median number of live births to women over age 45 years was 9.5, compared with 10.4 in the Hutterites. Age-specific marital fertility rates and birth intervals closely resembled those of the Hutterites.

Adolescent↗

Video and qualitative research: analysing medical practice and interaction.

CONTEXT: Video has long been recognised as providing an important resource within medical education, particularly, perhaps, for training in primary health care. As a resource for research, and more specifically within qualitative social science studies of medical practice, video has proved less pervasive, despite its obvious advantages. METHODS: In this paper, we sketch an approach to using video to inform the analysis of medical practice and the ways in which health care is accomplished through social interaction and collaboration. Drawing on our own research, we discuss two brief examples: the first involves the use of computing technology in primary health care and the second concerns informal instruction during surgery. The examples illustrate the multimodal character of medical work, how activities are accomplished through the interplay of talk, the visual and the use of material artefacts. They also illustrate the ways in which video provides access to the complex forms of social interaction and collaboration that underpin health care. DISCUSSION: We reflect upon the research opportunities afforded by video and the ways in which video-based studies of interaction can contribute to the practice and practicalities of medicine.

Clinical Medicine↗

Social and psychological perspectives on voluntary sterilization: a review.

This paper reviews social science research on the antecedents and consequences of voluntary sterilization. The major conclusions are that socioeconomic status has little impact on the decision to be sterilized and that sterilizations are rare among those without sons and among male non-whites. Significant others are important sources of encouragement and information, and good marital relations increase the likelihood of having the procedure performed. Most acceptors experience no change in sexual activity, quality of marital relationships, or work-related behavior, and few regret their choice. Negative consequences are more likely among those in India, those coerced into having a sterilization, those who did not understand the consequences of the procedure, those with health complications after sterilization, and those couples who have unstable marriages or who disagree about sterilization.

Adult↗

Mapping of alkaline proteins in bovine skeletal muscle.

In agricultural sciences, proteomics has become the new hope for analyzing the meat quality traits that are closely related to the skeletal muscle traits. 2-DE muscle maps of many species have been recently reported and used to find molecular markers of meat quality traits. However, one limitation of 2-DE based analyses is due to the limited alkaline protein separation. Considering this problem, there is a need to use recent advances that have markedly improved the 2-DE based analysis of alkaline proteins. Hence, the present study provides additional information concerning the alkaline proteome of bovine skeletal muscle by using an appropriate protocol to characterize proteins over the entire range of pH 7-11. A total of 32 distinct gene products corresponding to 60 protein spots were identified by PMF and grouped in seven categories according to their main function. This 2-D map will contribute to muscle proteome studies since a significant portion of proteins is in the alkaline pH range.

Animals↗

Position paper on the development of a middle level provider in nuclear medicine: the nuclear medicine practitioner.

The development of an educational program and credentialing structure to support and recognize an advanced level of the practice of nuclear medicine technology is now underway. This work parallels the efforts in many, if not most, health care disciplines as they seek to achieve the twin goals of developing enhanced career paths and providing the best possible patient care in an environment where science and technology can run roughshod over concepts taught in the classroom a mere decade ago. Education is key to both goals. A master's level degree in nuclear medicine technology, coupled with an advanced practice credential recognizing both the educational achievement and a level of clinical expertise, will give nuclear medicine practitioners the knowledge and the right to practice their profession at a high level of autonomy, leading to more efficient and higher quality health care services. To that end the following position paper was prepared by members of the Advance Practice Task Force of the SNMTS and presented to the SNMTS Executive Council and the SNM Board of Directors. In June 2005, the executive council and the board of directors approved a resolution supporting the establishment of a middle level provider in nuclear medicine known as the nuclear medicine practitioner.

Credentialing↗

Contrast sensitivity function in eyes with diffractive bifocal intraocular lenses.

PURPOSE: To evaluate the image quality of asymmetric Acri. Twin bifocal intraocular lenses (IOLs) (Acri.Tec) by comparing distance and near black-white contrast sensitivity function with that of the Pharmacia 811E IOL. SETTING: Department of Ophthalmology, Medical University of Vienna, Vienna, Austria. METHODS: Thirty-two eyes of 16 patients were examined after contralateral implantation of 1 Acri. Twin near-weighted 733D IOL and 1 Acri. Twin distance-weighted 737D IOL. Twenty eyes in 10 patients were examined after binocular Pharmacia 811E IOL implantation. Best corrected distance and near visual acuities were determined. Individual reading distance was recorded and corrected to 40 cm for the near contrast test (Holladay Contrast Acuity Test). Distance contrast sensitivity function was evaluated using the Acuity Max (Science 2020) computer program. RESULTS: Best corrected distance visual acuity was significantly better in patients with the 737D IOL than in those with the 733D or 811E IOLs. For distance reading with best distance correction, the 733D IOL performed better than the 737D and the 811E. Individual reading distance with the Acri. Twin IOL and 811E IOL was 33.6 cm and 34.0 cm, respectively. Best distance-corrected near contrast sensitivity function was better in eyes with the near-weighted 733D IOL. Binocular testing showed a significant difference between the 2 groups only at low-contrast values. At distance, contrast sensitivity function was better with the 737D IOL, whereas no difference was found between the 733D and the 811E IOLs. Binocular contrast sensitivity function at distance revealed statistically significantly better results in the Acri. Twin group. CONCLUSION: An asymmetric diffractive bifocal lens system was advantageous in terms of vision quality when implanted binocularly and superior to monocular stronger weighted focus compared with conventional bifocal IOLs.

Adult↗

The journal impact factor as a predictor of trial quality and outcomes: cohort study of hepatobiliary randomized clinical trials.

OBJECTIVES: To examine the association between the impact factor and characteristics of hepatobiliary randomized clinical trials. METHODS: A cohort study of 530 hepatobiliary randomized clinical trials was performed. The journal impact factor was extracted from Science Citation Index. For each trial, we extracted the sample size, the quality of randomization and blinding methods, and the statistical significance of the primary outcome measure. RESULTS: The median sample size was 45 participants (interquartile range 25-88). The allocation sequence generation was adequate in 273 trials (52%). Allocation concealment was adequate in 178 trials (34%). The primary outcome measure was statistically significant in 374 (71%) trials. Nonparametric analyses for trend indicated that the impact factor was significantly associated with the sample size (p < 0.01) and the proportion of trials with adequate allocation sequence generation (p < 0.01) or allocation concealment (p= 0.02). The impact factor was not significantly associated with the study outcome (p= 0.28). CONCLUSIONS: The present study supports the use of the impact factor as a rough quality indicator. However, even trials in high impact journals may be small or may have inadequate quality. Critical appraisal of individual trials is always necessary, irrespective of the place of publication.

Bibliometrics↗