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   2388330篇
  免费   199285篇
  国内免费   4237篇
耳鼻咽喉   34481篇
儿科学   73272篇
妇产科学   63472篇
基础医学   336974篇
口腔科学   67720篇
临床医学   218132篇
内科学   471599篇
皮肤病学   48150篇
神经病学   202418篇
特种医学   96290篇
外国民族医学   886篇
外科学   362012篇
综合类   56508篇
现状与发展   1篇
一般理论   1007篇
预防医学   192656篇
眼科学   55720篇
药学   178616篇
  4篇
中国医学   4379篇
肿瘤学   127555篇
  2018年   24713篇
  2017年   19156篇
  2016年   20972篇
  2015年   23682篇
  2014年   34147篇
  2013年   51625篇
  2012年   69926篇
  2011年   73546篇
  2010年   43154篇
  2009年   41422篇
  2008年   69784篇
  2007年   74129篇
  2006年   75043篇
  2005年   73095篇
  2004年   70187篇
  2003年   67797篇
  2002年   66956篇
  2001年   112668篇
  2000年   116748篇
  1999年   98551篇
  1998年   28001篇
  1997年   25632篇
  1996年   25561篇
  1995年   24710篇
  1994年   23279篇
  1993年   21633篇
  1992年   79562篇
  1991年   76539篇
  1990年   73709篇
  1989年   70988篇
  1988年   65960篇
  1987年   64917篇
  1986年   61442篇
  1985年   58502篇
  1984年   44299篇
  1983年   37731篇
  1982年   22951篇
  1981年   20369篇
  1979年   41375篇
  1978年   29050篇
  1977年   24384篇
  1976年   22870篇
  1975年   24014篇
  1974年   29685篇
  1973年   28082篇
  1972年   26276篇
  1971年   24194篇
  1970年   22778篇
  1969年   21108篇
  1968年   19152篇
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
21.
22.
23.
24.
25.
26.
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   
27.
28.
29.
BACKGROUND The adenoma detection rate(ADR) is inversely associated with the incidence of interval colorectal cancer and serves as a benchmark quality criterion during screening colonoscopy. However, adenoma miss rates reach up to 26% and studies have shown that a second inspection of the right colon in retroflected view(RFV) can increase ADR.AIM To assess whether inspection of the whole colon in RFV compared to standard forward view(SFV) can increase ADR.METHODS Patients presenting for screening or surveillance colonoscopy were invited to participate in this randomized controlled trial and randomized into two arms. In RFV arm colonoscopy was initially performed with SFV, followed by a second inspection of the whole colon in RFV. In the SFV arm first withdrawal was performed with SFV, followed by a second inspection of the whole colon again with SFV. Number, size and morphology of polyps found during first and second inspection in each colonic segment were recorded and all polyps were removed and sent for histopathology in separate containers.RESULTS Two hundred and five patients were randomly assigned to the RFV(n = 101) and SFV(n = 104) arm. In the RFV arm, both polyp detection rate(PDR) and ADR were increased under second inspection in RFV(PDR 1~(st) SFV: 39.8%, PDR 2~(nd)RFV: 46.6%; ADR 1~(st) SFV: 35.2%, ADR 2~(nd) RFV: 42%). Likewise, in the SFV arm,PDR and ADR were increased under second inspection(PDR 1~(st) SFV: 37.5%, PDR 2~(nd) SFV: 46.6%; ADR 1~(st) SFV: 34.1%, ADR 2~(nd)SFV: 44.3%) with no significant differences in ADR and PDR between the SFV and RFV arm. Mean number of adenomas per patient(APP) was increased in the RFV and SFV(APP RFV arm: 1~(st) SFV: 1.71; 2~(nd) RFV: 2.38; APP SFV arm: 1~(st) SFV: 1.83, 2~(nd)SFV:2.2). The majority of adenomas additionally found during second inspection in RFV or in SFV were located in the transverse and left-sided colon and were 5 mm in size.CONCLUSION Second inspection of the whole colon leads to increased adenoma detection with no differences between SFV and RFV. Hence, increased detection is most likely a feature of the second inspection itself but not of the inspection mode.  相似文献   
30.
Gattermann  J. 《Der Onkologe》2020,26(11):1010-1018
Die Onkologie - Die Corona-Pandemie hat in den letzten Monaten verdeutlicht, dass das Thema Sterblichkeit trotz erheblicher Fortschritte im Bereich der Hospiz- und Palliativversorgung zu...  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