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   514185篇
  免费   34034篇
  国内免费   615篇
耳鼻咽喉   6897篇
儿科学   16841篇
妇产科学   13529篇
基础医学   85155篇
口腔科学   14501篇
临床医学   44380篇
内科学   93728篇
皮肤病学   12158篇
神经病学   36501篇
特种医学   18469篇
外国民族医学   63篇
外科学   77144篇
综合类   8469篇
一般理论   118篇
预防医学   38964篇
眼科学   12137篇
药学   40619篇
中国医学   1006篇
肿瘤学   28155篇
  2018年   4935篇
  2015年   4521篇
  2014年   6072篇
  2013年   9562篇
  2012年   12897篇
  2011年   14318篇
  2010年   8325篇
  2009年   7801篇
  2008年   13732篇
  2007年   14733篇
  2006年   14989篇
  2005年   14402篇
  2004年   14107篇
  2003年   13450篇
  2002年   13323篇
  2001年   24104篇
  2000年   25119篇
  1999年   20594篇
  1998年   5440篇
  1997年   4719篇
  1996年   5051篇
  1995年   4638篇
  1994年   4327篇
  1993年   4142篇
  1992年   15751篇
  1991年   16335篇
  1990年   16442篇
  1989年   15820篇
  1988年   14596篇
  1987年   14438篇
  1986年   13619篇
  1985年   12997篇
  1984年   9650篇
  1983年   8258篇
  1982年   4569篇
  1981年   4232篇
  1979年   9427篇
  1978年   6861篇
  1977年   5777篇
  1976年   5606篇
  1975年   6400篇
  1974年   7643篇
  1973年   7137篇
  1972年   6961篇
  1971年   6688篇
  1970年   6173篇
  1969年   5891篇
  1968年   5566篇
  1967年   5014篇
  1966年   4453篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36 weeks gestational age)...  相似文献   
3.
4.
5.
6.
7.
8.
9.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  相似文献   
10.
BACKGROUND Minimally invasive surgery for gastric cancer(GC) has gained widespread use as a safe curative procedure especially for early GC.AIM To determine risk factors for postoperative complications after minimally invasive gastrectomy for GC.METHODS Between January 2009 and June 2019, 1716 consecutive patients were referred to our division for primary GC. Among them, 1401 patients who were diagnosed with both clinical and pathological Stage Ⅲ or lower GC and underwent robotic gastrectomy(RG) or laparoscopic gastrectomy(LG) were enrolled. Retrospective chart review and multivariate analysis were performed for identifying risk factors for postoperative morbidity.RESULTS Morbidity following minimally invasive gastrectomy was observed in 7.5% of the patients. Multivariate analyses demonstrated that non-robotic minimally invasive surgery, male gender, and an operative time of ≥ 360 min were significant independent risk factors for morbidity. Therefore, morbidity was compared between RG and LG. Accordingly, propensity-matched cohort analysis revealed that the RG group had significantly fewer intra-abdominal infectious complications than the LG group(2.5% vs 5.9%, respectively; P = 0.038), while no significant differences were noted for other local or systemic complications.Multivariate analyses of the propensity-matched cohort revealed that non-robotic minimally invasive surgery [odds ratio = 2.463(1.070–5.682); P = 0.034] was a significant independent risk factor for intra-abdominal infectious complications.CONCLUSION The findings showed that robotic surgery might improve short-term outcomes following minimally invasive radical gastrectomy by reducing intra-abdominal infectious complications.  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