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Biomedical subjects

J F Price

Publications and source records attributed to J F Price.

At least 19 recordsLinked to original sources
PubMed2000

Lipid-lowering for lower limb atherosclerosis.

BACKGROUND: Raised lipid levels, including cholesterol, are important risk factors in the development of lower limb arterial disease (atherosclerosis). OBJECTIVES: The objective of this review was to assess the effects of lipid lowering therapy in patients with lower limb atherosclerosis. SEARCH STRATEGY: The reviewers searched the Cochrane Peripheral Vascular Diseases Group trials register, Embase, reference lists of relevant articles, and contacted trial investigators in Europe and pharmaceutical companies. SELECTION CRITERIA: Randomised trials of lipid-lowering therapy in patients with lower limb atherosclerosis. The main outcomes were mortality, non-fatal events, direct tests of disease progression, indirect measurements of disease, and subjective measures. DATA COLLECTION AND ANALYSIS: Two reviewers extracted data and assessed trial quality independently. The reviewers contacted investigators to obtain information needed for the review that could not be found in published reports. MAIN RESULTS: There were nine eligible trials, but two were excluded because of poor methodology. The seven remaining trials involved a total of 698 participants from seven different countries. Men and women participated in all but one trial and were generally middle aged to elderly. The follow-up period varied from four months to three years. The overall quality of the included trials was high. The trials were heterogeneous in terms of inclusion criteria, type of drugs used and outcomes measured. Lipid-lowering therapy produced a marked but non-significant reduction in mortality (odds ratio 0.21, 95% confidence interval 0. 03 to 1.17), but little change in non-fatal events (odds ratio 1.21, 95% confidence interval 0.80 to 1.83). In two trials there was a significant overall reduction in disease progression on angiogram (odds ratio 0.47, 95% confidence interval 0.29 to 0.77). The changes in ankle brachial pressure index and walking distance were inconsistent, although trials showed a general improvement in symptoms that could not be combined in a meta-analysis. Side effects were generally mild, with the exceptions of liver toxicity produced by betapyridil and the adverse effect of probucol on lipoprotein profile. REVIEWER'S CONCLUSIONS: Lipid-lowering therapy may be useful in preventing deterioration of underlying disease and alleviating symptoms. These results cannot determine whether one lipid-lowering regimen is better than another.

Arteriosclerosis↗
PubMed2000

Steroid sex hormones for lower limb atherosclerosis.

BACKGROUND: There is accumulating evidence that steroid sex hormones have a beneficial effect on a number of risk factors for peripheral arterial disease. OBJECTIVES: The objective of this review was to determine whether exogenous steroid sex hormones are an effective treatment for patients with lower limb atherosclerosis. SEARCH STRATEGY: The Cochrane Peripheral Vascular Diseases Group trials register was searched, together with reference lists from relevant articles and reviews obtained through searches of Embase and Medline. SELECTION CRITERIA: Randomised controlled trials of steroid sex hormones in patients with lower limb atherosclerosis were selected. DATA COLLECTION AND ANALYSIS: Both reviewers extracted data and assessed trial quality independently. Whenever possible investigators were contacted to obtain information needed for the review that could not be found in published reports. MAIN RESULTS: Four trials appeared to meet the inclusion criteria, but one was excluded because of poor methodology and another is awaiting translation into English. The two remaining trials compared testosterone treatment with placebo in a total of 83 men with intermittent claudication. No trials were available which investigated the potentially beneficial effects of oestrogenic hormones in women with lower limb atherosclerosis. Testosterone therapy produced no improvement in tests of walking distance or in a variety of other objective tests for peripheral arterial disease, including venous filling time, muscle blood flow and plethysmography. The odds ratio for subjective improvement in symptoms using the combined trial results was also non-significant (odds ratio 1.28, 95% confidence interval 0.61 to 2.65). REVIEWER'S CONCLUSIONS: There is no evidence to date that short-term testosterone treatment is beneficial in male subjects with lower limb atherosclerosis. However, this might reflect limited data rather than the lack of a real effect.

Arteriosclerosis↗
PubMed2000

Nonatopic wheezy children have reduced interferon-gamma.

Viruses cause asthmatic exacerbations in schoolchildren. We tested the hypothesis that children who wheezed with viral respiratory tract infections secrete higher levels of the type 1 cytokine interferon-gamma (IFN-gamma) in the peripheral circulation than children who had never wheezed. Blood was taken from 13 children (eight atopic) with episodic wheeze and 11 controls. CD4 and CD8 cells were separated from peripheral blood mononuclear cells and stimulated with phorbol 12-myrisate 13-acetate (PMA) and ionomycin for 24 h. IFN-gamma, IL-4, and IL-5 were measured in the supernatant by ELISA. IFN-gamma production by CD4 and CD8 cells was lower in children with a history of wheeze (CD4, P = 0.046; CD8, P = 0.037). These children were then analysed according to atopic status. CD4 and CD8 IFN-gamma production in nonatopic wheezy children was reduced (CD4, P=0.009; CD8, P=0.003). IFN-gamma production by atopic wheezy children was lower than by controls, but the differences were not significant (CD4, P = 0.2831; CD8, P = 0.1372). CD8 IL-5 was lower in children who wheezed (P=0.012). Release of IL-4 and IL-5 by CD4 cells did not differ between the three groups. We propose that defective IFN-gamma secretion by CD4 and CD8 cells may contribute to viral-induced wheeze in nonatopic children.

CD4-Positive T-Lymphocytes↗
PubMed2000

Production of the potent neutrophil chemokine, growth-related protein alpha (GROalpha), is not elevated in cystic fibrosis children.

Progressive neutrophil-mediated lung damage causes much of the morbidity and mortality in cystic fibrosis (CF). Neutrophil chemoattractants implicated in CF include interleukin (IL-)8, tumour necrosis factor (TNFalpha) and leukotriene (LT)B4, but growth-related protein alpha (GROalpha), a highly potent neutrophil chemokine, has not been investigated. Atopic status has been considered to contribute to the marked heterogeneity of pulmonary disease in CF. We hypothesized that GROalpha may be produced in biologically-significant amounts in the CF lung, and that enhanced production of GROalpha, IL-8 or LTB4 may contribute to the poorer lung function seen in atopic CF patients compared to non-atopic CF patients. GROalpha, IL-8 and LTB4 levels in the sputum of atopic and non-atopic CF patients were assessed by immunoassays, and GROalpha and IL-8 levels were also assessed in the plasma of CF patients and normal controls. As expected, there were high levels of IL-8 and LTB4 in most CF sputum samples, and IL-8 levels were higher in CF plasma than in control plasma (P=0.02). In contrast, GROalpha was undetectable (< 5 pg ml(-1)) in the sputum of 21 out of 25 CF patients, with low levels (range 144-825 pg ml(-1)) in the remainder, and median levels of GROalpha in CF plasma (33 pg ml(-1), n=24) were not significantly different from controls (34 pg ml(-1), n=25). Lung function [forced expiratory volume in 1 sec (FEV1) and forced vital capacity (FVC)] was significantly poorer in atopic CF compared to non-atopic CF patients (P<0.02), but sputum levels of GROalpha, IL-8 and LTB4 were not different between the subgroups. Our results suggest that unlike LTB4 and IL-8, GROalpha does not contribute to neutrophilic inflammation in the CF lung, and other factors must determine the impaired lung function observed in atopic CF patients. These results may have important implications in the development of chemokine receptor antagonists as novel anti-inflammatory agents in CF.

Adolescent↗
PubMed2000

Mycobacterium tuberculosis infection in pediatric liver transplant recipients.

OBJECTIVES: To study the incidence, clinical presentation, management, complications and outcome of tuberculosis in pediatric liver transplant recipients. METHODS: A retrospective review of the medical records of children who underwent liver transplantation between 1991 and 1998. RESULTS: Mycobacterium tuberculosis infection occurred in 6 of 254 (2.4%) children undergoing liver transplantation between 1991 and 1998. Cough, pyrexia and poor appetite were common presentations; one-half had normal chest radiographs. The median time to confirmation of diagnosis was 8 months (range, 1 to 17 months). Tests contributing to diagnosis included: Ziehl-Neelsen (ZN) stain (2 patients), M. tuberculosis polymerase chain reaction (1 patient), Mantoux test (1 patient) and histopathology (4 patients). Family health screening was productive for 4 patients. Duration of treatment varied from 9 to 18 months. Isoniazid-induced hepatitis was observed in 2 patients but resolved with dose reduction. Two patients died while receiving treatment, one of Klebsiella spp. septicemia and the other of pulmonary hemorrhage. CONCLUSIONS: Tuberculosis after liver transplantation has a significant morbidity and mortality. Pretransplantation a personal and family history of tuberculosis must be sought, and screening of patients and their families should be considered. Standard regimens incorporating isoniazid and rifampin are effective, but regular monitoring of liver function is essential to detect drug-induced hepatotoxicity.

Adolescent↗
PubMed2000

A randomized field trial in Oakland, California.

This study evaluates the impact of a civil remedy program (Beat Health) on drug and disorder problems under experimental field trial conditions. Using calls for service data, the authors find statistically significant differences between the control and experimental groups, when drug problem calls prior to the start of the intervention were compared to drug calls during a 12-month follow-up period. The Beat Health sites, especially the residential sites, improved relative to the control sites. By contrast, the control treatment (patrol response) led to significant increases in drug problems, particularly at the commercial properties included in this study. The authors also examined the spatial influences of the Beat Health and patrol responses in catchment areas surrounding each of the 100 study sites. The results show some improvement in the experimental residential sites. The authors found, however, a possible displacement of drug problems in and around both the commercial experimental and control sites. They show that the displacement effect is most notable in the commercial control sites.

California↗
PubMed2000

Influence of high-density lipoprotein cholesterol and rheological factors on the sex difference in cardiovascular disease.

BACKGROUND: It is well established that the incidence of cardiovascular disease among men is higher than that among women. OBJECTIVE: To determine whether differences between men and women in terms of a range of conventional and rheological risk factors could explain this sex difference. DESIGN: This was a population-based cohort study (the Edinburgh Artery Study). METHODS: Men and women aged 55-74 years (n = 1592) were selected at random from the general population of Edinburgh and followed up for 5 years. Baseline cardiovascular risk factors were measured and related to incidence of disease among men and women. RESULTS: Men had higher levels of cigarette smoking, haematocrit and blood viscosity and lower levels of low-density lipoprotein (LDL) cholesterol, high-density lipoprotein (HDL) cholesterol and plasma fibrinogen than did women. The incidences of cardiovascular events among men and women were 48.3 and 26.1 per 1000 person-years, respectively. Adjustment for level of HDL cholesterol reduced the male:female ratio for sex-specific incidence rates of cardiovascular events from 1.80 [95% confidence interval (CI) 1.43-2.27] to 1.34 (95% CI 1.04-1.73). This reduction was partially reversed after further adjustment for the other cardiovascular risk factors. The impact of blood viscosity, plasma viscosity and plasma level of fibrinogen on the risk of cardiovascular disease was higher for men than it was for women (multivariate relative risk for blood viscosity were 1.24, 95% CI 1.08-1.43, for men and 0.81, 95% CI 0.61-1.06, for women). CONCLUSIONS: Levels of HDL cholesterol levels in women being higher than those in men may explain some, but not all, of the sex difference in incidence of cardiovascular disease. Greater susceptibility of men to rheological factors might also be important.

Age Distribution↗
PubMed1999

Tidal breathing parameters in young children: comparison of measurement by respiratory inductance plethysmography to a facemask pneumotachograph system.

The ratio of expiratory time at tidal peak flow to total expiratory time (t(ptef)/t(e)) correlates with conventional measures of airway obstruction. It is usually assessed using a facemask and pneumotachograph system which may be poorly tolerated in young children and hence limits the usefulness of this technique. We therefore determined in young asthmatic children the accuracy of t(ptef)/t(e), using an uncalibrated respiratory inductance plethysmograph (RIP), and compared the results with those from a facemask-pneumotachograph system. We also assessed whether age influenced the agreement between measurements using the two devices. Forty-seven children aged between 1 month and 12 years were recruited: 39 were inpatients recovering from an acute wheezy episode, and 8 were recruited from the asthma clinic. All were receiving bronchodilators. Tidal breathing parameters t(ptef)/t(e), the duty cycle (t(i)/t(tot)), and respiratory rate were initially measured using the Respitrace alone and then simultaneously with both the Respitrace and the facemask-pneumotachograph system. Eight children did not tolerate the facemask, and in two others it was impossible to analyze the Respitrace trace due to artefacts. In the remaining 37 children, the reliability coefficients and coefficients of variation of the two techniques were similar. Similar values of t(i)/t(tot) and respiratory rate were obtained using the two devices. The mean t(ptef)/t(e) obtained using the Respitrace was lower than with the facemask-pneumotachograph system (P < 0.01), although this was age group-dependent (P < 0.05), as the difference was less apparent in the 1 to 2-year-old children than in other age groups. Application of the facemask-pneumotachograph system did not significantly influence the results obtained using the Respitrace. We conclude that uncalibrated respiratory inductance plethysmography can measure tidal breathing parameters as reliably as a facemask-pneumotachograph system in young asthmatic children, and is better tolerated than the pneumotachograph system. The results obtained using the two devices are not interchangeable.

Age Factors↗
PubMed1999

The role of haematological factors in diabetic peripheral arterial disease: the Edinburgh artery study.

The relationship between haematological factors and peripheral arterial disease (PAD) among diabetics has not been widely examined. 1592 men and women aged 55-74 years were selected from the general population. They underwent an assessment for PAD and a glucose tolerance test. 288 subjects (18.7%) were identified as having diabetes or impaired glucose tolerance (IGT). Among the diabetes/IGT group, median levels of fibrinogen, von Willebrand factor (VWF), tissue plasminogen activator (t-PA), fibrin D-dimer and plasma viscosity were higher in subjects with PAD than those without PAD (P </= 0.05). The prevalence of PAD was higher in those with diabetes/IGT (20.6%) compared to those with normal glucose tolerance (12.5%) (odds ratio 1.64; 95% CI 1.17, 2.31). After separate adjustment for fibrinogen, VWF, t-PA, fibrin D-dimer, leucocyte elastase, plasma viscosity and haematocrit, those with diabetes/IGT no longer had a significantly higher risk of PAD compared to those with a normal glucose tolerance test. Simultaneous adjustment for the first four of these haematological factors reduced the risk of PAD among subjects with diabetes/IGT to 1.11 (95% CI 0.76, 1.63). Increased levels of haemostatic factors may partly explain the higher prevalence of PAD in diabetic/IGT subjects compared to normal glucose-tolerant subjects. Future randomized controlled trials involving the indirect lowering of levels of haematological factors should help to explain whether the associations reported here are of causal significance.

Aged↗
PubMed1999

Relationship between smoking and cardiovascular risk factors in the development of peripheral arterial disease and coronary artery disease: Edinburgh Artery Study.

AIMS: The aim was to determine whether the effect of smoking on the development of peripheral or coronary artery disease might be mediated by other cardiovascular risk factors, including dietary antioxidant vitamin intake, serum low and high density lipoproteins, blood pressure, plasma fibrinogen, blood viscosity and markers of endothelial disturbance and fibrin turnover. METHODS AND RESULTS: 1592 men and women aged 55-74 years were selected at random from 11 general practices in Edinburgh, Scotland and followed-up for 5 years. The incidences of peripheral arterial disease and coronary artery disease were 5.1% and 11.1%, respectively. Both conditions were more common in moderate and heavy smokers than in never smokers: cigarette smoking was a stronger risk factor for peripheral arterial disease than for coronary artery disease. Smoking was associated with reduced dietary antioxidant vitamin intake, serum high density lipoprotein cholesterol and diastolic blood pressure and with increased alcohol intake, serum triglycerides, blood viscosity, plasma fibrinogen, and markers of endothelial disturbance (tissue plasminogen activator and von Willebrand factor antigens). Simultaneous adjustment for these risk factors reduced the relative risk of peripheral arterial disease only slightly, from 3.94 (95% CI 2.04, 7.62) to 2.72 (95% CI 1.13, 6.53) in heavy smokers and from 1.87 (95% CI 0.91, 3.85) to 1.70 (95% CI 0.72, 3.99) in moderate smokers. Similar adjustment also had little effect on the risk of coronary artery disease associated with smoking. CONCLUSION: The combined effect of smoking on the cardiovascular risk factors studied may explain part of its influence on peripheral and coronary arterial disease, but the majority of the effect appears to be due to other mechanisms.

Aged↗
PubMed1999

Retrospective review of cystic fibrosis presenting as infantile liver disease.

The mode of presentation, clinical course, and outcome of 12 infants with cystic fibrosis and liver disease referred over an 18 year period were investigated retrospectively. Median age at presentation was 6.5 weeks (range, 5-12). Two thirds were boys. Conjugated hyperbilirubinaemia was the presenting symptom in 11 patients, and hypoalbuminaemia in one. Jaundice was cleared over a median period of 7.36 months. Eight patients had bile duct proliferation on liver biopsy and one required cholangiography to exclude biliary atresia. Classic histological features of cystic fibrosis were only present in two children biopsied at 8 and 18 months. Three patients had meconium ileus, including one infant with concomitant alpha(1) antitrypsin deficiency, who required early liver transplantation. All other patients had no signs of significant chronic liver disease during a median follow up of 42 months (range, 10-205). Children with cystic fibrosis and infantile liver disease have a good short and medium term prognosis.

Albuminuria↗
PubMed1999

Role of systolic blood pressure and plasma triglycerides in diabetic peripheral arterial disease. The Edinburgh Artery Study.

OBJECTIVE: To determine the risk factors for peripheral arterial disease (PAD) in a diabetic population and to examine whether different levels of these risk factors might explain why diabetic subjects have an increased risk of PAD compared with normal glucose tolerance subjects. RESEARCH DESIGN AND METHODS: There were 1,592 men and women aged 55-74 years selected at random from the age-sex registers of 11 general practices in Edinburgh, Scotland. Subjects underwent a comprehensive medical examination, including assessment for PAD (intermittent claudication on World Health Organization questionnaire or major asymptomatic disease on noninvasive testing) and a glucose tolerance test. RESULTS: Of the subjects, 288 (18.7%) were found to have diabetes or impaired glucose tolerance (IGT). The prevalence of PAD was greater in those with diabetes/IGT (20.6%) compared with those with normal glucose tolerance (12.5%) (odds ratio [OR] 1.64, 95% CI 1.17-2.31). Among the diabetes/IGT group, mean levels of smoking, systolic blood pressure, and triglycerides were higher in subjects with PAD than in those without PAD (P < or = 0.05). Mean levels of systolic blood pressure and plasma triglycerides were also higher in diabetic subjects than in nondiabetic subjects with PAD (P < or = 0.05). In multivariate analysis, those with diabetes/IGT no longer had a significantly higher risk of PAD after adjusting separately for systolic blood pressure (OR 1.22, 95% CI 0.85-1.73) and plasma triglycerides (OR 1.26, 95% CI 0.89-1.79). Simultaneous adjustment for both systolic blood pressure and triglycerides reduced the risk of PAD among diabetic subjects to 1.11 (95% CI 0.78-1.58). CONCLUSIONS: Increased mean levels of triglycerides and systolic blood pressure may help to explain the higher prevalence of PAD in diabetic subjects compared with that in normal glucose tolerance subjects.

Aged↗
PubMed1998

Young people's drug use: facts and feelings.

The study aimed to quantify the major findings of a previous qualitative study on drug use and young people. Findings are reported on drug use; views on the use of cannabis; amphetamines and heroin; and the relationship between these views and reported drug use. Reported usage and feelings about drug use are discussed in relation to the extent to which drug use can be considered to be 'normalised'. There is only weak evidence that normalisation, even of cannabis use, is true for young people towards the end of their compulsory schooling. However the findings provide some evidence for both sides in the 'normalisation debate' against a backdrop of apparent increasing use of drugs. Until more evidence is available, the normalisation debate will continue.

Adolescent↗
PubMed1998

Thermal inactivation of Escherichia coli O157:H7, Salmonella senftenberg, and enzymes with potential as time-temperature indicators in ground turkey thigh meat.

The USDA Food Safety and Inspection Service has proposed to amend cooking regulations to require that any thermal process used for poultry products be sufficient to cause a 7 D reduction in salmonellae. Several enzymes have been suggested as potential indicators of heat processing in poultry, yet no relationship between the inactivation rates of these enzymes and salmonellae had been determine. The thermal inactivation kinetics of endogenous muscle proteins. Escherichia coli O157:H7 and Salmonella senftenberg were compared in ground turkey thigh meat in thermal death time studies. Bacteria counts were determined and muscle extracts were assayed for residual enzyme activity or protein concentration D and zeta values were calculated using regression analysis. S. senftenberg had higher D values at all temperatures and was more heat resistant than E. coli. The zeta values of E. coli on Petrifilm Coliform Count plates and phenol red sorbitol agar plates were 6.0 and 5.7 degrees C, respectively. The zeta values of S. senftenberg were 5.6 and 5.4 degrees C on Petrifilm and agar, respectively. Lactate dehydrogenase (LDH) was the most heat stable protein at 64 degrees C. LDH, glyceraldehyde-3-phosphate dehydrogenase, creatine kinase, triose phosphate isomerase (TPI), acid phosphatase, serum albumin, and immunoglobulin G had zeta values of 3.8,4.3,4.8,5.8,6.3,6.7, and 8.6 degrees C, respectively , in turkey containing 4.3% fat. The zeta values for TPI decreased to 5.4 degrees C in thigh meat containing 9.8% fat. Temperature function of TPI was most similar to that of S. senftenberg, suggesting it might function as an endogenous time-temperature integrator to monitor adequacy of processing when a performance standard based on this pathogen is implemented.

Acid Phosphatase↗
PubMed1997

Growth during one year of treatment with fluticasone propionate or sodium cromoglycate in children with asthma.

The aim of this study was to compare accurately measured growth over 12 months in asthmatic children treated with either fluticasone propionate (FP) 50 micrograms twice daily (b.i.d.) or sodium cromoglycate (SCG) 20 mg four times daily (q.i.d.). After a 2-week run-in, asthmatic children aged 4-10 years from 15 UK centers were randomized in a 3:4 ratio to open-label FP (n = 52) or SCG (n = 70). After 8 weeks, those whose asthma was not adequately controlled were switched from SCG to FP or withdrawn. Standing height was measured (Holtain stadiometry) at baseline, after 8 weeks and at 6 weeks intervals thereafter for 1 year. Morning peak flows (PEFam) were recorded by patients for 2 weeks during baseline, and 1 week before each visit during treatment. Urinary free cortisol (24 h) was measured at baseline, 6 months, and 1 year. After 8 weeks, 22 patients were withdrawn from SCG group (and were switched to FP), and five patients were withdrawn from the FP group due to poor asthma control. A further 21 and 11 patients were withdrawn from the SCG and FP groups, respectively, during the course of the study. There were no significant differences between patients who received FP and SCG for 1 year (n = 34 and n = 26, respectively) in terms of height velocity adjusted for age and gender (HV), or height velocity standard deviation scores adjusted for gender (HVSDS). Mean HV (mean HVSDS) were 6.0 cm/yr (0.1) and 6.5 cm/yr (0.5) for FP and SCG, respectively. There were no treatment differences in mean 24 h urinary free cortisol levels at 6 and 12 months. Mean % predicted PEFam improved over 1 year in both groups but to a greater degree in the FP group. We concluded that growth was normal in mildly asthmatic children receiving FP (50 micrograms bid) for 1 year. There were fewer withdrawals and lung function improved to a greater extent in FP treated patients than in patients receiving SCG.

Administration, Inhalation↗
PubMed1997

Steroid sex hormones and peripheral arterial disease in the Edinburgh Artery Study.

Although treatment with high dose exogenous sex hormones affects cardiovascular risk, the role of physiological levels of endogenous sex hormones in the development of atherosclerotic disease in men and women is unknown. Forty men and 43 women wit peripheral arterial disease and 88 age- and sex-matched controls were selected from participants in the Edinburgh Artery Study, a random survey of 1592 men and women ages 55-74 years from the general population. Compared with sex-matched controls, male cases had higher systolic blood pressure (155.5 mmHg vs. 138.7 mmHg; p < or = 0.01) and waist hip ratio (0.92 vs. 0.89; p < or = 0.05) and female cases had higher lifetime smoking (square root of packyears 2.14 vs. 1.03; p < or = 0.05). Mean estrone levels were slightly higher in male cases than controls (101.9 pmol/Liter vs. 92.1 pmol/Liter; p = 0.09), but this association lost significance after multivariate adjustment for age and body mass index. Mean levels of total and free testosterone, estradiol, and sex hormone binding globulin were not significantly different in cases compared with controls in either sex (p > 0.1). These results, in accordance with previous prospective studies on coronary artery disease, do not support a role for physiological levels of endogenous sex hormones in the development of peripheral arterial disease in men or postmenopausal women.

Age Factors↗