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PubMed2003

The marketing of alcohol to college students: the role of low prices and special promotions.

BACKGROUND: Heavy episodic or binge drinking has been recognized as a major problem on American college campuses affecting the health, safety, and education of students. The present study examines the alcohol environment surrounding college campuses and assesses the impact on students' drinking. This environment includes alcohol promotions, price specials, and advertising at drinking establishments that serve beer for on-premise consumption as well as retail outlets that sell beer for off-premise consumption. METHODS: The study used student self-report data from the 2001 College Alcohol Study (CAS) and direct observational assessments by trained observers who visited alcohol establishments in communities where the participating colleges were located. The analytic sample included more than 10,000 students as well as 830 on-premise and 1684 off-premise establishments at 118 colleges. RESULTS: Alcohol specials, promotions, and advertisements were prevalent in the alcohol outlets around college campuses. Almost three quarters of on-premise establishments offered specials on weekends, and almost one half of the on-premise establishments and more than 60% of off-premise establishments provided at least one type of beer promotion. The availability of large volumes of alcohol (24- and 30-can cases of beer, kegs, party balls), low sale prices, and frequent promotions and advertisements at both on- and off-premise establishments were associated with higher binge drinking rates on the college campuses. In addition, an overall measure of on- and off-premise establishments was positively associated with the total number of drinks consumed. CONCLUSIONS: The regulation of marketing practices such as sale prices, promotions, and advertisements may be important strategies to reduce binge drinking and its accompanying problems.

Adult↗
PubMed1994

Special problems of the female athlete.

The number of women of all ages participating in physical activity is consistently increasing. Although there are numerous benefits to physical activity, specific problems may occur along the various stages of the female athlete's life, which need special attention. A remarkably late menarche, exaggerated beyond the expected genetic predisposition and a high prevalence of abnormal or absent menstrual cycles is seen in athletes, especially in dancers and long distance runners. Reproductive system dysfunction is associated with multiple factors, of which nutritional intake and caloric balance seem to be of a special importance. A high proportion of athletes suffer from pathological eating behaviours and there is an overlap between many features of anorexic patients and highly active athletes. The pathophysiology seen in most cases is hypo-oestrogenism due to suppression of the GnRH pulse generator. The mechanism(s) causing this reversible hypothalamic dysfunction are yet unknown. Of major concern are the skeletal abnormalities, including failure to reach peak bone mass, reduced bone density, scoliosis and stress fractures as a result of prolonged hypo-oestrogenism. Hormone replacement may be indicated in cases in which reduction of exercise or weight gain is not feasible or unsuccessful. Other populations that need special precautions are pregnant athletes and older women.

Adolescent↗
PubMed1996

A direct demonstration of functional specialization within motion-related visual and auditory cortex of the human brain.

BACKGROUND: Physiological studies of the macaque brain have shown that there is a large expanse of visual cortex, the V5 complex, which is specialized for visual motion, and that several areas within V5 are specialized for different kinds of visual motion. In continuing work on motion-related visual cortex, we wished to chart the specialized visual motion areas in the human brain and to determine their anatomical relationship. Human subjects viewed different motion displays, and the cortical location of the increased activity produced by each stimulus was recorded. The technique of functional magnetic resonance imaging (fMRI) was used, in order to image the same subjects repeatedly. RESULTS: We found that each of the three motion stimuli activated specific parts of the V5 complex. These sites of activation overlap with V5 and, to a smaller extent, with each other. Unexpectedly, the three motion stimuli also activated neighbouring, but nonoverlapping, regions of auditory cortex that are normally activated by the perception of speech. CONCLUSIONS: The three sites of activation produced by the visual motion stimuli occupy adjacent territories within the V5 complex. Components of the V5 complex are specifically connected to regions within auditory cortex.

Auditory Cortex↗
PubMed1999

Computational studies of the development of functionally specialized neural modules.

Three hypotheses about the activity-dependent development of functionally specialized neural modules are discussed in this review. These hypotheses state that: (1) a combination of structure function correspondences plus the use of competition between neural modules leads to functional specializations; (2) parcellation is due to a combination of neural selectionism, the idea that learning results from a stabilization of some neural connections and the elimination of others, and a locality constraint, which states that connections between nearby neurons are more easily stabilized than those between distant neurons; and (3) a temporal and spatial modulation of plasticity can induce higher functional development in later-developing parts of the nervous system relative to earlier-developing parts. All three hypotheses have been implemented and evaluated in computational models. Limitations of current neuroscientific methodologies mean that computer simulation provides one of the only tools available for evaluating and refining our large-scale theories of the development of functionally specialized neural modules.

Journal Article↗
PubMed2003

Implementing computerized physician order entry: the importance of special people.

OBJECTIVE: To articulate important lessons learned during a study to identify success factors for implementing computerized physician order entry (CPOE) in inpatient and outpatient settings. DESIGN: Qualitative study by a multidisciplinary team using data from observation, focus groups, and both formal and informal interviews. Data were analyzed using a grounded approach to develop a taxonomy of patterns and themes from the transcripts and field notes. RESULTS: The theme we call Special People is explored here in detail. A taxonomy of types of Special People includes administrative leaders, clinical leaders (champions, opinion leaders, and curmudgeons), and bridgers or support staff who interface directly with users. CONCLUSION: The recognition and nurturing of Special People should be among the highest priorities of those implementing computerized physician order entry. Their education and training must be a goal of teaching programs in health administration and medical informatics.

Focus Groups↗
PubMed1999

Hemispheric specialization using SPECT and stimulation tasks in children with dysphasia and dystrophia.

Developmental dysphasia, a severe childhood learning disorder, is thought to result from problems in hemispheric specialization involving both left and right cerebral hemispheres. Regional cerebral blood flow (rCBF) was measured at rest and during stimulation of both hemispheres independently: dichotic listening for the left, dichaptic palpation for the right. Eight right-handed boys with expressive dysphasia, aged 8 to 12 years, were investigated using SPECT and compared with eight right-handed age-matched boys with Duchenne muscular dystrophy with reading disorders but normal speech. rCBF values at rest were also compared with those of five right-handed age-matched normal boys. In the dichotic task, children with dysphasia differed from children with dystrophia by failure to increase rCBF in the left hemisphere, in Broca's area, but rCBF increased in the right hemisphere, in the region homologous to Broca's area. In the dichaptic task, rCBF increased bilaterally for children with dysphasia whereas in children with dystrophia rCBF increased only in the right hemisphere. At rest the physiological asymmetry was reversed in favor of the right hemisphere in all areas except Broca's area. Surprisingly, the same applied at rest and for all areas in children with dystrophia. These results confirm that functional specialization of both hemispheres is impaired in developmental dysphasia. Moreover, they suggest that learning disabilities associated with Duchenne muscular dystrophy could also be related to abnormal hemispheric specialization.

Adolescent↗
PubMed2005

Abundance and distribution of fleas on desert rodents: linking Taylor's power law to ecological specialization and epidemiology.

We investigated variation in the abundance-prevalence relationships of fleas among 17 different flea-host associations as well as among different species of hosts and fleas in the Negev desert. We explored variation in the value of exponent of Taylor's power relationship with changes in flea community size and flea specialization (host specificity and seasonal pattern of activity). We tested if a simple epidemiological model can reproduce the pattern of the abundance-prevalence relationship. We confirmed aggregated distribution of fleas within a population of host species as well as across a whole host community and the existence of a positive relationship between local flea abundance and their prevalence. Prevalence, mean abundance and variance of abundance were significantly higher in host specific than host opportunistic fleas. When ecological specialization was considered, based on a seasonal pattern of activity, these parameters were higher in year-round-active than seasonal fleas. The degree of flea specialization and flea community richness affected the pattern of the relationship between mean abundance and its variance. Power law slopes decreased with increasing richness of flea community. A simple epidemiological model based on mean flea abundance and degree of aggregation, corrected for host sample size, can predict the observed pattern of prevalence. In some cases, observed flea prevalence was higher than that predicted from the epidemiological model. The discrepancy of the observed prevalence from that predicted by the model can be explained by either a relatively low negative effect of flea parasitism on a host (at least, in terms of pathology) or strong resistance of a host to flea parasitism or both.

Animals↗
PubMedDate not supplied

Specialized neuropeptide Y- and glucagon-like immunoreactive amacrine cells in the peripheral retina of the turtle.

There are many regional differences in cell morphology and neurochemistry in the retina. This study examined a specialized population of neuropeptide Y- and glucagon-like immunoreactive amacrine cells in the peripheral retina of the turtle. Some of the dendritic processes from these peptidergic amacrine cells formed a dense circumferentially oriented nerve fiber plexus which ran parallel to the ora serrata. Collaterals from this plexus projected into and innervated the nonpigmented ciliary epithelium in the pars plana region of the ciliary body. Electron microscopy revealed that the neuropeptide Y- and glucagon-like immunoreactive processes in the ciliary epithelium contained many labeled, large dense-cored vesicles. Small crystals of lipid-soluble fluorescent dye were implanted in the retina near the ora serrata in fixed retinal tissue to search for other peripheral retinal specializations. Numerous thick and thin cell processes oriented parallel to the ora serrata were labeled in the retina by the dye. In addition, many dye-labeled somata with circumferentially oriented dendritic arborizations were seen in the extreme periphery of the retina. Many of these dye-labeled cells and processes were clearly not associated with the neuropeptide Y- and glucagon-like immunoreactive cells described above. This study has shown that some peptidergic neurons in the peripheral retina have a unique morphology in comparison to more centrally located cells. The function of these specialized peripheral cells is not established, but the innervation of the ciliary epithelium by peptidergic amacrine cells suggests that they may be involved in control of aqueous inflow.

Animals↗
PubMed2000

Modeling the bacterial photosynthetic reaction center 3: interpretation of effects of site-directed mutagenesis on the special-pair midpoint potential.

Interpretation of changes in midpoint potential of the "special pair" in bacterial photosynthetic reaction centers caused by site-directed mutagenesis is discussed in terms of a simple tight-binding model which relates them to concomitant variations in spin distribution between the two bacteriochlorophyll molecules of the special pair. Our analysis improves on previous similar ones by Allen and co-workers [Artz, K., Williams, J. C., Allen, J. P., Lendzian, F., Rautter, J., and Lubitz, W. (1997) Proc. Natl. Acad. Sci. U.S.A. 94, 13582; Ivancich, A., Artz, K., Williams, J. C., Allen, J. P., and Mattioli, T. A. (1998) Biochemistry 37, 11812] in that it is both more complete, including electron-phonon coupling, and more accurate. It is applied to analyze data for a series of M160 mutants of Rhodobacter sphaeroides, yielding a value of 0.18+/-0.03 eV for the electronic coupling energy between the highest occupied levels of the two bacteriochlorophylls in the wild-type and a value of the energy offset E(o) between the highest occupied molecular orbitals of the L and M bacteriochlorophylls of 0.14+/-0.03 eV. For a mutant in which the electron hole in the special pair cation is located entirely on the reactive (L) side, a potential of 641+/-30 mV with respect to the normal hydrogen electrode is predicted. This agrees well with the average value ca. 650 mV observed for the heterodimer mutant HL(M202) in which the bacteriochlorophyll on the unreactive M side has been replaced by a bacteriopheophytin, causing extensive charge localization. However, the deduced coupling is found to be very sensitive to small changes in the assumptions used in the model, and various important chemical effects remain to be included.

Bacteriochlorophylls↗
PubMed1996

Shift of the special pair redox potential: electrostatic energy computations of mutants of the reaction center from Rhodobacter sphaeroides.

Shifts of the special pair redox potential of the photosynthetic reaction center of Rhodobacter sphaeroides are considered for several point mutations [Lin. X., Murchison, H. A., Nagarijan, V., Parson, W. W., Allen, J. P., & Williams, J. C. (1994) Proc. Natl. Acad. Sci. U.S.A. 91, 10265-10269] in the neighborhood of the special pair. The shifts are calculated from electrostatic energies by solving Poisson's equation for energy-minimized structures of the reaction center. Different conditions for the evaluation of the electrostatic energy are probed. To test the influence of the hydrogen bonding at the acetyl groups of the special pair, the orientation and torsion potential of the acetyl groups are varied. The calculated shifts of the midpoint potential of double and triple mutants can approximately be obtained from the corresponding shifts of the single point mutations. The calculated shifts agree with the measured values for all single and double mutants considered. However, a clear decision between different acetyl group conformations was only possible for the mutants HF(L168) and HF(L168) + LH(L131) where the calculated shifts of the redox potential agree with experiments only if the acetyl oxygen atom at DM points toward the Mg2+ ion of DL. This is corroborated by computations of the interaction energy of the acetyl group at DM, which adopts a lower value in the wild-type reaction center if its oxygen atom is bonded to the Mg2+ ion of DL.

Bacteriochlorophylls↗
PubMed1999

ENDOR and special TRIPLE resonance spectroscopy of photoaccumulated semiquinone electron acceptors in the reaction centers of green sulfur bacteria and heliobacteria.

Photoaccumulation at 205 K in the presence of dithionite produces EPR signals in anaerobically prepared membranes from Chlorobium limicola and Heliobacterium chlorum that resemble the EPR spectrum of phyllosemiquinone (A1*-) photoaccumulated in photosystem I. We have used ENDOR and special TRIPLE resonance spectroscopy to demonstrate conclusively that these signals arise from menasemiquinone electron acceptors reduced by photoaccumulation. Hyperfine couplings to two protons H-bonded to the semiquinone oxygens have been identified by exchange of H. chlorum into D2O, and hyperfine couplings to the methyl group, and the methylene group of the phytyl side chain, of the semiquinone have also been assigned. The electronic structure of these menasemiquinones in these reaction centers is very similar to that of phyllosemiquinone in PSI, and shows a distorted electron spin density distribution relative to that of phyllosemiquinone in vitro. Special TRIPLE resonance spectrometry has been used to investigate the effect of detergents and oxygen on membranes of C. limicola. Triton X-100 and oxygen affect the menaquinone binding site, but n-dodecyl beta-D-maltoside preparations exhibit a relatively unaltered special TRIPLE spectrum for the photoaccumulated menasemiquinone.

Bacteria↗
PubMed2004

A unified description of the electrochemical, charge distribution, and spectroscopic properties of the special-pair radical cation in bacterial photosynthesis.

We apply our four-state 70-vibration vibronic-coupling model for the properties of the photosynthetic special-pair radical cation to: (1) interpret the observed correlations between the midpoint potential and the distribution of spin density between the two bacteriochlorophylls for 30 mutants of Rhodobacter sphaeroides, (2) interpret the observed average intervalence hole-transfer absorption energies as a function of spin density for six mutants, and (3) simulate the recently obtained intervalence electroabsorption Stark spectrum of the wild-type reaction center. While three new parameters describing the location of the sites of mutation with respect to the special pair are required to describe the midpoint-potential data, a priori predictions are made for the transition energies and the Stark spectrum. In general, excellent predictions are made of the observed quantities, with deviations being typically of the order of twice the experimental uncertainties. A unified description of many chemical and spectroscopic properties of the bacterial reaction center is thus provided. Central to the analysis is the assumption that the perturbations made to the reaction center, either via mutations of protein residues or by application of an external electric field, act only to independently modify the oxidation potentials of the two halves of the special pair and hence the redox asymmetry E0. While this appears to be a good approximation, clear evidence is presented that effects of mutation can be more extensive than what is allowed for. A thorough set of analytical equations describing the observed properties is obtained using the Born-Oppenheimer adiabatic approximation. These equations are generally appropriate for intervalence charge-transfer problems and include, for the first time, full treatment of both symmetric and antisymmetric vibrational motions. The limits of validity of the adiabatic approach to the full nonadiabatic problem are obtained.

Journal Article↗
PubMed2000

Wittig reactions on photoprotoporphyrin IX: new synthetic models for the special pair of the photosynthetic reaction center.

A first example of spirochlorin-chlorin dimer with fixed distances and orientations as potential model for the "special pair" of the photosynthetic reaction center is discussed. For the preparation of such a novel structure, the Wittig reagent of the desired "spacer" 5 was reacted with photoprotoporphyrin IX dimethyl ester 3 to produce the intermediate dimer 6, which on intramolecular [4 + 2] Diels-Alder cycloaddition gave an unexpected spirochlorin-chlorin dimer 9. Dehydration of dimer 6 under acid-catalyzed conditions generated the corresponding spirochlorin-porphyrin dimer 16 in quantitative yield. The asymmetry in dimer 6 caused by the biphenyl-type anisotropic effect was confirmed by NMR and model studies. The formation of dihydrobenzoporphyrin 14 by reacting chlorin 3 with the phosphonium salt of p-methylbenzylbromide 10 and isolation of 8-phenanthrenevinylporphyrin 19 from chlorin 7 further confirmed our proposed mechanism for the formation of a spirochlorin-chlorin dimer 9. Following a similar approach, chlorin 3 on reacting with bis-phosphonium salt of 4, 4'-bischloromethylbiphenyl produced conjugated chlorin dimer 25. The spectroscopic data obtained from these dimers suggest that, in these compounds, the individual chromophores are not behaving as an individual molecule, but as a single macrocycle. To examine whether the pi-pi interaction exhibited by dimer 9 resembles the structural arrangement of bacteriochlorophylls in reaction center (RC), we investigated the geometrical parameters used to characterize the pi-pi interactions in tetrapyrrolic macrocycles. Starting from the crystallographic coordinates of 9, the molecular mechanics energy minimization was performed to obtain the model dimer structure. The geometrical parameters that measure the single pyrrole ring overlap were used to compare the model structure with the crystallographic coordinates of the special pair in photosynthetic reaction center. The results indicated that the ring A of spirochlorin and the ring C of chlorin in our model dimer 9 mimic the ring A-ring A interaction found in the crystallographic special pairs, which are strategically placed by the surrounding photosynthetic reaction center protein matrix.

Dimerization↗
PubMed2001

A 3-D model of membrane specializations between human auditory spiral ganglion cells.

A three-dimensional model of the cell membrane contact area was made between two large spiral ganglion cells (type 1 cells) from a cell cluster in a normal human cochlea. The freshly fixed cochlea had been removed during skull base surgery, processed, and sectioned for ultrastructural analysis. 400 consecutive serial thin sections were prepared from the apical portion where the nerve cell density is high and cell clusters are numerous. A cell cluster is defined as a conglomerate of two or more nerve cell bodies, surrounded by common Schwann cells. Direct physical contact between ganglion cell membranes (ephapse) was possible, in places where adjacent cells lacked a separating Schwann cell layer (gaps). One such gap was selected, and observed in 57 of 90 consecutive sections. Membrane specializations, observed in 36 sections, were found to be of principally three different types namely: (1) symmetrical, (2) asymmetrical, and (3) asymmetrical subplasmalemmal. The functional properties of these membrane specializations are still unknown. Asymmetrical densities were seen on one or other of the two cell membranes. A graphic model based on serial thin sections was made to illustrate the gap area. Superficially membrane specializations were seen to form small disk-like areas varying in size, the largest measuring 3 x 2 microm. It is speculated whether these unique formations between human spiral ganglion cells, which have not been observed in other species, may constitute interactive electrotonic or ephaptic transmission pathways. These may be in the low-frequency region and may increase plasticity and signal acuity related to the coding of speech.

Auditory Pathways↗
PubMed2003

Community health and nutrition screening for Special Olympics athletes.

Since 1961, Special Olympics has provided sports training and athletic competition for people with mental retardation. A recent addition to these Olympics has been the Healthy Athletes Program, designed to help the athletes improve their health and fitness, leading to enhanced sports experiences and well being. Original health services included dental and eye screening. In 2002, Special Olympics Delaware piloted a Wellness Park to add nutrition, blood pressure, and flexibility screening. Faculty from a university's health college trained discipline-specific students to conduct the screenings. Thirty nutrition and dietetics students measured height, weight, waist circumference, and calculated body mass index (BMI) for the athletes. Figures and risk-assessments were recorded on a "health report card." Two hundred ten athletes attended the nutrition screening. Ages ranged from 8 to 63 years; 81 percent males and 19 percent females. According to BMI standards, 32 percent of the athletes were overweight; 17 percent were obese. Twenty-five percent of adult males and 73 percent of adult females had a high risk waist circumference. Athletes at high risk for obesity-related diseases were referred to their primary physician for follow up. Nutrition education handouts included a simplified Food Guide Pyramid, tips for healthy eating in restaurants, 5 A Day information, and healthful hydration guides. Approximately 1,250 athletes participate in Special Olympics Delaware each year, providing a great opportunity to do some much needed health screening and improve access to health care for this often neglected population.

Adolescent↗
PubMed1998

Introduction to special section: early Mars.

Ongoing studies of the evolution of the Martian cratered highlands, the nature of the planet's early climate, and the recent announcement of possible evidence of ancient life in the ALH 84001 meteorite have reinvigorated interest in the conditions that prevailed on Mars during its first billion years of geologic history. To address this interest and assess our current understanding of these issues, the Lunar and Planetary Institute hosted a 4-day Conference on Early Mars in Houston in April of 1997. The papers contained in this special section are a product of that meeting. The purpose of the conference was twofold: (1) to consider how impacts, volcanism, and the presence of abundant water affected the physical and chemical environment that existed on Mars 4 Gyr ago, particularly as it related to the nature of the global climate, the origin of the valley networks, the geologic and mineralogic evolution of the surface, the aqueous geochemistry of groundwater, and the existence of local environments that may have been conducive to the development of indigenous life and the preservation of its signature in the geologic record; and (2) to discuss what observations or experiments might he included in future spacecraft missions to test the ideas and expectations arising from purpose 1. While pertinent issues of early atmospheric and solar evolution were also addressed, the primary discussion at the conference focused on the evidence and constraints provided by the geologic records of Earth, the Moon, and Mars and analysis of the SNC meteorites. The papers contained in this special section span the full range of these topics, including the stability of the early atmosphere to erosion by the solar wind, the geologic environment from which the SNC meteorites originated, geomorphic evidence regarding the nature of the early Martian climate and hydrologic cycle, the potential impact of the past and present environment on the preserved signature of ancient life, and a discussion of the capabilities of a lander-based X ray diffraction and fluorescence instrument to assess the potential for past fossilization from the mineralogy of the current local surface environment. The issues raised at the conference, and by the papers included in this special section, will be the focus of ongoing attention as the intensity and scope of Mars exploration increases over the next decade.

Evolution, Planetary↗
PubMed2001

Women with a history of placental abruption: when in a subsequent pregnancy should special surveillance for a recurrent placental abruption be initiated?

BACKGROUND: It is common to admit to hospital or start intensive ambulatory antenatal care of pregnant women with a previous placental abruption using the gestational age of the previous placental abruption as a starting point. In some instances, close surveillance may be commenced much earlier. There is no consensus when in a subsequent pregnancy such measures should be initiated. OBJECTIVE: The analyses aimed at the prevention of complicated (preterm, small for gestational age, or perinatal death) recurrent placental abruptions, assessing at which time in a subsequent pregnancy special surveillance should start in order to anticipate and prevent a recurrence. DESIGN: A cohort study based on the Medical Birth Registry of Norway. Calculation of gestational age specific risks of placental abruption in a second pregnancy and estimation of when to initiate surveillance in order to reduce an increased risk of recurrent placental abruption to the initial level of initial abruption in the second pregnancy. RESULTS: In women with a complicated (preterm, small for gestational age, or perinatal death) first delivery, the risks of an initial and recurrent complicated placental abruption in the second pregnancy were 7/1000 and 33/1000, respectively (relative risk 4.9). To reduce the recurrence risk in a second pregnancy to 7/1000, special surveillance six weeks prior to the gestational age of the initial abruption would be necessary. In women with an uncomplicated first delivery, the risks in the second pregnancy of an initial and recurrent complicated abruption were 3 and 19/1000, respectively (relative risk 7.1). To reduce the recurrence risk to 3/1000, surveillance at least 12 weeks prior would be necessary. CONCLUSION: The increased recurrence rate would necessitate increased awareness in terms of special surveillance in the second pregnancy. In pregnancies at risk of a recurrent placental abruption, monitoring up to three months before the gestational age of the initial abruption is necessary.

Abruptio Placentae↗
PubMed2002

Clinical and translational research: introduction to the special issue.

This special issue represents an effort by the journal Experimental and Clinical Psychopharmacology to emphasize its interdisciplinary mission by encouraging the writing of articles on clinical research and the interchange between basic and clinical research on mental illness and the addictions. This special issue opens with a commentary from A. I. Leshner (2002), retired director of the National Institute on Drug Abuse, which emphasizes the importance of translating research findings into clinical practice. Four review articles and 12 original research reports provide a broad sampling of contemporary clinical research, including behavioral therapy, pharmacotherapy, psychiatric comorbidity, and special populations, and also illustrate linkages between clinical research and basic fields of inquiry, including behavioral theory, neuropsychology, neuropharmacology, and statistics.

Behavior, Addictive↗