首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   9825篇
  免费   711篇
  国内免费   33篇
耳鼻咽喉   82篇
儿科学   347篇
妇产科学   248篇
基础医学   1385篇
口腔科学   239篇
临床医学   1098篇
内科学   2132篇
皮肤病学   176篇
神经病学   912篇
特种医学   202篇
外科学   1053篇
综合类   135篇
一般理论   7篇
预防医学   1053篇
眼科学   172篇
药学   687篇
  2篇
中国医学   42篇
肿瘤学   597篇
  2023年   108篇
  2022年   95篇
  2021年   381篇
  2020年   247篇
  2019年   304篇
  2018年   322篇
  2017年   241篇
  2016年   214篇
  2015年   242篇
  2014年   347篇
  2013年   517篇
  2012年   722篇
  2011年   657篇
  2010年   392篇
  2009年   363篇
  2008年   580篇
  2007年   623篇
  2006年   518篇
  2005年   482篇
  2004年   472篇
  2003年   448篇
  2002年   400篇
  2001年   124篇
  2000年   92篇
  1999年   102篇
  1998年   81篇
  1997年   83篇
  1996年   55篇
  1995年   44篇
  1994年   58篇
  1993年   53篇
  1992年   79篇
  1991年   77篇
  1990年   65篇
  1989年   60篇
  1988年   63篇
  1987年   74篇
  1986年   53篇
  1985年   50篇
  1984年   42篇
  1983年   58篇
  1982年   36篇
  1981年   27篇
  1980年   28篇
  1979年   29篇
  1978年   25篇
  1976年   24篇
  1974年   28篇
  1970年   32篇
  1969年   30篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
BackgroundEpidemiological studies on peptic ulcer disease (PUD) have shown a recent decrease in hospital admissions in Western countries.ObjectiveThis paper aimed to study the current status and risk factors of PUD in a Nigerian metropolis.MethodsA cross-sectional study of symptomatic patients at upper gastrointestinal (GI) endoscopy diagnosed with PUD from February 2014 to September 2019 at a referral endoscopy facility in Port Harcourt, Niger delta region of Nigeria. The variables studied included demographics, symptoms and duration, blood group, chronic non-steroidal anti-inflammatory (NSAID) use, smoking, endoscopic and histology findings. Statistical analysis was performed using SPSS version 20.ResultsA total of 434 upper GI endoscopies were performed during the study period with thirty-one diagnosis of PUD made. The mean age of gastric ulcer (GU) and duodenal ulcer (DU) cases were 54.4 ± 20.2yrs and 48.1 ± 14.5yrs respectively (p = 0.367). GU to DU ratio was 1.4:1. H. pylori infection, chronic NSAID use and blood group O were seen in 7(22.5%), 8(25.8%) and 18(72.0%) respectively. Major indication in 21(67.7%) cases was gastrointestinal bleeding.ConclusionThere is a low diagnostic rate of PUD (6.7%) with pre-pyloric antral gastric ulcers as most common type and multifactorial aetiology.  相似文献   
4.
5.
6.
The jobs of Latino manual laborers place their mental and physical health at risk. This study evaluates the associations among musculoskeletal pain, mental health, and work organization in Latino manual laborers. Farmworkers and nonfarmworkers (n = 189) in North Carolina were interviewed for self-reported musculoskeletal pain, depressive symptoms, stress, work safety climate, and precarious job status. More nonfarmworkers than farmworkers had neck and shoulder pain, but they did not differ in other areas of musculoskeletal pain. Depressive symptoms had a significant association with neck and shoulder pain (p < .05). Precariousness had a significant association with back pain (p < .05). Farmworker participants had H-2A visas and were afforded some protection compared to nonfarmworker manual workers. Research is needed to improve policy that relieves pain and improves mental health for all Latino manual workers.  相似文献   
7.
8.
9.
10.
For patients who receive a liver transplant (LTX) for alcoholic liver disease (ALD), investigators are focusing beyond survival to determine specific alcohol use outcomes. Studies suggest the use of alcohol ranges from 8 to 22% for the first post-transplant year with cumulative rates reaching 30 to 40% by 5 years following transplantation. Yet while investigators are interested in determining specific rates of alcohol use and predictors of use, only three studies since 1990 have been prospective. In 1998, we began a prospective study of post-LTX alcohol consumption in ALD recipients using multiple repeated measures of alcohol use. After 5 years of follow-up, we found that 22% had used any alcohol by the first year and 42% had a drink by 5 years. By 5 years, 26% drank at a heavier use (binge) pattern and 20% drank in a frequent pattern. In a univariate model, predictors of alcohol use included pre-transplant length of sobriety, a diagnosis of alcohol dependence, a history of other substance use, and prior alcohol rehabilitation.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号