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   1335724篇
  免费   95959篇
  国内免费   2911篇
耳鼻咽喉   19716篇
儿科学   40236篇
妇产科学   38695篇
基础医学   187361篇
口腔科学   39850篇
临床医学   112682篇
内科学   262581篇
皮肤病学   30206篇
神经病学   106404篇
特种医学   53947篇
外国民族医学   435篇
外科学   208422篇
综合类   31047篇
现状与发展   6篇
一般理论   436篇
预防医学   92047篇
眼科学   31359篇
药学   100086篇
  4篇
中国医学   2989篇
肿瘤学   76085篇
  2018年   11749篇
  2015年   11896篇
  2014年   16714篇
  2013年   25273篇
  2012年   33050篇
  2011年   34925篇
  2010年   20771篇
  2009年   20258篇
  2008年   33649篇
  2007年   36761篇
  2006年   37323篇
  2005年   36070篇
  2004年   35162篇
  2003年   34150篇
  2002年   33685篇
  2001年   63651篇
  2000年   65380篇
  1999年   55430篇
  1998年   14678篇
  1997年   13474篇
  1996年   12964篇
  1995年   12243篇
  1994年   11490篇
  1992年   42789篇
  1991年   41308篇
  1990年   40589篇
  1989年   39580篇
  1988年   36989篇
  1987年   36438篇
  1986年   34923篇
  1985年   33118篇
  1984年   24839篇
  1983年   21064篇
  1982年   12670篇
  1981年   11579篇
  1980年   10780篇
  1979年   23939篇
  1978年   17075篇
  1977年   14849篇
  1976年   13395篇
  1975年   15269篇
  1974年   18089篇
  1973年   17563篇
  1972年   16815篇
  1971年   15725篇
  1970年   14921篇
  1969年   14350篇
  1968年   13463篇
  1967年   12022篇
  1966年   11261篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
151.
Struan H. Coleman 《Arthroscopy》2019,35(4):1109-1110
Dancers have a disproportionately high prevalence of hip issues compared with other types of athletes. Many of these hip issues are complex: a cam and/or pincer impingement combined with a seemingly paradoxical borderline dysplasia, capsular laxity, and subsequent instability. Our experience as nonarthritic hip surgeons tells us that careful patient selection is critical for a successful outcome after the arthroscopic treatment of a dancer. But, there is little guidance in the literature on the management of this specific group of patients. We have studies that advise us to repair the labrum when possible versus performing labral debridement in female patients with predominantly pincer-type impingement and studies that support capsular plication and careful capsule closure in patients, predominantly female patients, with combined hip impingement and dysplasia or borderline dysplasia. However, few studies have examined predictors of outcomes after hip arthroscopy in dancers.  相似文献   
152.
153.
154.
155.
156.
157.
Monatsschrift Kinderheilkunde - Fusionen und Übernahmen in der Pharmaindustrie haben zu einer Konzentration geführt, von der auch die Impfstoffproduktion mit nur noch wenigen global...  相似文献   
158.
Abstract

The leading cause of death of adolescents in developed countries is injury. Alcohol is a major contributor to adolescent injury. Most of the injury deaths in youth are caused by traffic crashes. Driving under the influence (DUI) and riding with a driver who is under the influence (RUI) of alcohol increase the risk of road crash. The focus of this study is how adolescents’ risk of DUI and RUI differ in relation to their experience of parental control and peer pressure to substance use, other risky behaviours and leisure time activities. The analyses are based on data from the European School Survey Project on Alcohol and Other Drugs collected from 15- to 16-year-old Finnish adolescents in 2015 (n?=?4049, response rate 88.7%). The study shows that problems tend to entangle in some adolescent groups in which DUI and RUI are also more common. Adolescents with higher probability of using various substances, of starting alcohol use at young age, of experiencing weak parental control, and high peer pressure are at higher risk of DUI and RUI. The results indicate that professionals and authorities handling underage DUI and RUI ought to consider adolescents’ situation as a whole.  相似文献   
159.
160.
Postoperative pulmonary complications are associated with an increase in mortality, morbidity and healthcare utilisation. The Agency for Healthcare Research and Quality recommends risk assessment for postoperative respiratory complications in patients undergoing surgery. In this hospital registry study of adult patients undergoing non-cardiac surgery between 2005 and 2017 at two independent healthcare networks, a prediction instrument for early postoperative tracheal re-intubation was developed and externally validated. This was based on the development of the Score for Prediction Of Postoperative Respiratory Complications. For predictor selection, stepwise backward logistic regression and bootstrap resampling were applied. Development and validation cohorts were represented by 90,893 patients at Partners Healthcare and 67,046 patients at Beth Israel Deaconess Medical Center, of whom 699 (0.8%) and 587 (0.9%) patients, respectively, had their tracheas re-intubated. In addition to five pre-operative predictors identified in the Score for Prediction Of Postoperative Respiratory Complications, the final model included seven additional intra-operative predictors: early post-tracheal intubation desaturation; prolonged duration of surgery; high fraction of inspired oxygen; high vasopressor dose; blood transfusion; the absence of volatile anaesthetic use; and the absence of lung-protective ventilation. The area under the receiver operating characteristic curve for the new score was significantly greater than that of the original Score for Prediction Of Postoperative Respiratory Complications (0.84 [95%CI 0.82–0.85] vs. 0.76 [95%CI 0.75–0.78], respectively; p < 0.001). This may allow clinicians to develop and implement strategies to decrease the risk of early postoperative tracheal re-intubation.  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