全文获取类型
收费全文 | 1215篇 |
免费 | 68篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 19篇 |
儿科学 | 20篇 |
妇产科学 | 43篇 |
基础医学 | 227篇 |
口腔科学 | 38篇 |
临床医学 | 59篇 |
内科学 | 235篇 |
皮肤病学 | 17篇 |
神经病学 | 64篇 |
特种医学 | 21篇 |
外科学 | 180篇 |
综合类 | 18篇 |
一般理论 | 1篇 |
预防医学 | 165篇 |
眼科学 | 13篇 |
药学 | 104篇 |
中国医学 | 15篇 |
肿瘤学 | 48篇 |
出版年
2023年 | 5篇 |
2021年 | 26篇 |
2020年 | 12篇 |
2019年 | 26篇 |
2018年 | 38篇 |
2017年 | 27篇 |
2016年 | 33篇 |
2015年 | 30篇 |
2014年 | 35篇 |
2013年 | 42篇 |
2012年 | 76篇 |
2011年 | 95篇 |
2010年 | 56篇 |
2009年 | 33篇 |
2008年 | 78篇 |
2007年 | 91篇 |
2006年 | 85篇 |
2005年 | 60篇 |
2004年 | 62篇 |
2003年 | 67篇 |
2002年 | 38篇 |
2001年 | 34篇 |
2000年 | 53篇 |
1999年 | 25篇 |
1998年 | 5篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1992年 | 10篇 |
1991年 | 9篇 |
1990年 | 5篇 |
1989年 | 10篇 |
1988年 | 7篇 |
1987年 | 7篇 |
1986年 | 5篇 |
1985年 | 9篇 |
1984年 | 4篇 |
1980年 | 2篇 |
1979年 | 7篇 |
1977年 | 3篇 |
1976年 | 3篇 |
1974年 | 5篇 |
1973年 | 6篇 |
1972年 | 4篇 |
1971年 | 8篇 |
1970年 | 5篇 |
1969年 | 7篇 |
1968年 | 10篇 |
1967年 | 6篇 |
1966年 | 5篇 |
1965年 | 2篇 |
排序方式: 共有1287条查询结果,搜索用时 15 毫秒
71.
A longitudinal analysis of unmet need for oral treatment in a national sample of medical HIV patients
下载免费PDF全文
![点击此处可从《American journal of public health》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Marcus M Maida CA Coulter ID Freed JR Der-Martirosian C Liu H Freed BA Guzmán-Becerra N Andersen RM 《American journal of public health》2005,95(1):73-75
This longitudinal study examines perceived unmet dental need in a nationally representative probability sample of HIV-infected persons in medical care. A logistic regression analysis modeled the relationship between unmet need and explanatory variables. We estimate that 40% of HIV/AIDS patients report an unmet need associated with being male, being unemployed, injecting drugs, being heterosexual, lacking dental insurance, and having less education. Disparities in unmet need are related to socioeconomic status rather than to disease stage or ethnicity. 相似文献
72.
73.
74.
75.
Osteoporosis in men was not recognized as a major health problem until recently, and increased research in this area resulted in the approval of alendronate for the treatment of osteoporosis in men at the beginning of this decade. Low bone mineral density (BMD) has been demonstrated to be a strong predictor of fracture in men as it is in women. The causes of osteoporosis in men are variable and can be classified as primary or secondary. The aim of these report is to present the response of BMD in 10 Puerto Rican men with secondary causes of osteoporosis treated with alendronate. A significant increase of BMD in spine, total hip, trochanter and intertrochanteric regions were noted. A non-significant increase in femoral neck was observed. 相似文献
76.
Suárez B Lope V Pérez-Gómez B Aragonés N Rodríguez-Artalejo F Marqués F Guzmán A Viloria LJ Carrasco JM Martín-Moreno JM López-Abente G Pollán M 《Environmental research》2005,99(3):413-424
The purpose of this study was to evaluate exposure conditions and acute health effects in subjects participating in the Prestige oil spill cleanup activities and the association between these and the nature of the work and use of protection devices in the regions of Asturias and Cantabria (Spain). The sample comprised 400 subjects in each region, selected from a random sampling of all persons involved in cleanup activities, stratified by type of worker and number of working days. Data were obtained via a structured questionnaire and included information on specific tasks, number of working days, use of protective materials, and acute health effects. These effects were classified into two broad groups: injuries and toxic effects. Data analysis was performed using complex survey methods. Significant differences between groups were evaluated using Pearson's chi(2) test. Unconditional logistic regression was used to compute odds ratios and 95% confidence intervals. Bird cleaners accounted for the highest prevalence of injuries (19% presented with lesions). Working more than 20 days in highly polluted areas was associated with increased risk of injury in all workers. Occurrence of toxic effects was higher among seamen, possibly due to higher exposure to fuel oil and its components. Toxic effects were more frequent among those working longer than 20 days in highly polluted areas, performing three or more different cleaning activities, having skin contact with fuel oil on head/neck or upper limbs, and eating while in contact with fuel or perceiving disturbing odors. No severe disorders were identified among individuals who performed these tasks. However, potential health impact should be considered when organizing cleanup activities in similar environmental disasters. 相似文献
77.
78.
79.
80.
Sosa-Jurado F Zumaquero-Ríos JL Reyes PA Cruz-García A Guzmán-Bracho C Monteón VM 《Salud pública de México》2004,46(1):39-48
OBJECTIVE: To establish the relationship between seroprevalence for antibodies against Trypanosoma cruzi and its relationship with biotic and abiotic factors. MATERIAL AND METHODS: A cross-sectional study was conducted between August 2000 and September 2001. The study population consisted of a simple random sample of 390 volunteers residing in Palmar de Bravo, Puebla, Mexico. Sample and data collection procedures included assaying antibodies against T. cruzi with validated assays, and searching for domestic reservoirs and triatomine bugs. The relationship between biotic and abiotic factors with seropositivity was assessed. Statistical analysis was conducted using Kappa values for diagnostic tests; statistical significance was assessed with 2 x 2 tables, chi-squared test with Yates' correction, Fisher exact test, and odds ratios. RESULTS: The seroprevalence of T. cruzi infection in humans was 4%; in domestic reservoirs (horses, pigs, and dogs) only 10% of canine reservoirs were positive. Vector species recognized were T. borberi and T. pallidipennis, with a Dispersion Area Index and a Colonization Index of 55% and 40%, respectively. The most important risk factors associated with positive serology were altitude (>2,150 and <2,180 meters above sea level), presence of triatomines, age, time of residence, and participation in a social assistance program. CONCLUSIONS: T. cruzi infection was identified in human beings, vectors, and possibly in domestic reservoirs, in communities located over 2,000 meters above sea level. 相似文献