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   1422570篇
  免费   102402篇
  国内免费   4242篇
耳鼻咽喉   17522篇
儿科学   46727篇
妇产科学   37735篇
基础医学   208411篇
口腔科学   36453篇
临床医学   135080篇
内科学   276330篇
皮肤病学   26786篇
神经病学   120568篇
特种医学   52348篇
外国民族医学   366篇
外科学   199900篇
综合类   29617篇
现状与发展   1篇
一般理论   460篇
预防医学   122075篇
眼科学   29898篇
药学   103393篇
  6篇
中国医学   3168篇
肿瘤学   82370篇
  2021年   10905篇
  2019年   11642篇
  2018年   26292篇
  2017年   20436篇
  2016年   23147篇
  2015年   15561篇
  2014年   21057篇
  2013年   32301篇
  2012年   47082篇
  2011年   55960篇
  2010年   34329篇
  2009年   30346篇
  2008年   52226篇
  2007年   56961篇
  2006年   45378篇
  2005年   45477篇
  2004年   43951篇
  2003年   43104篇
  2002年   40798篇
  2001年   61134篇
  2000年   63015篇
  1999年   52474篇
  1998年   14763篇
  1997年   13528篇
  1996年   13254篇
  1995年   12613篇
  1994年   11800篇
  1993年   11061篇
  1992年   41700篇
  1991年   40902篇
  1990年   39575篇
  1989年   37455篇
  1988年   34692篇
  1987年   33822篇
  1986年   32257篇
  1985年   30740篇
  1984年   23103篇
  1983年   19658篇
  1982年   11829篇
  1979年   20900篇
  1978年   14876篇
  1977年   12082篇
  1976年   11941篇
  1975年   12112篇
  1974年   14827篇
  1973年   14483篇
  1972年   13356篇
  1971年   12418篇
  1970年   11514篇
  1969年   10448篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
ContextIt is especially important that patients are well informed when making high-stakes, preference-sensitive decisions like those on the Physician Orders for Life-Sustaining Treatment (POLST) form. However, there is currently no way to easily evaluate whether patients understand key concepts when making these important decisions.ObjectivesTo develop a POLST knowledge survey.MethodsExpert (n = 62) ratings of key POLST facts were used to select items for a POLST knowledge survey. The survey was administered to nursing facility residents (n = 97) and surrogate decision-makers (n = 112). A subset (n = 135) were re-administered the survey after a standardized advance care planning discussion to assess the scale's responsiveness to change.ResultsThe 19-item survey demonstrated adequate reliability (α = 0.72.). Residents' scores (x = 11.4, standard deviation 3.3) were significantly lower than surrogate scores (x = 14.7, standard deviation 2.5) (P < 0.001). Scores for both groups increased significantly after administration of a standardized advance care planning discussion (P < 0.001). Although being a surrogate, age, race, education, cognitive functioning, and health literacy were significantly associated with higher POLST Knowledge Survey scores in univariate analyses, only being a surrogate (P < 0.001) and being white (P = 0.028) remained significantly associated with higher scores in multivariate analyses.ConclusionThe 19-item POLST Knowledge Survey demonstrated adequate reliability and responsiveness to change. Findings suggest the survey could be used to identify knowledge deficits and provide targeted education to ensure adequate understanding of key clinical decisions when completing POLST.  相似文献   
64.
65.
66.
Nevo  N.  Goldstein  A. L.  Staierman  M.  Eran  N.  Carmeli  I.  Rayman  S.  mnouskin  Y. 《Hernia》2022,26(6):1491-1499
Hernia - The minimally invasive surgical repair of combined inguinal and ventral hernias often requires shifting from one approach or plane to another. The traditional enhanced-view totally...  相似文献   
67.
68.
69.
Red cell exchange (RCE) is a common procedure in adults with sickle cell disease (SCD). Implantable dual lumen Vortex (DLV) ports can be used for RCE in patients with poor peripheral venous access. We performed a retrospective cohort study of RCE procedures performed in adults with SCD. The main objective of the study was to compare the inlet speed, duration of procedures and rate of complications performed through DLV ports to those performed through temporary central venous and peripheral catheters. Twenty‐nine adults with SCD underwent a total of 318 RCE procedures. Twenty adults had DLV ports placed and 218 procedures were performed using DLV ports. Mean length of follow‐up after DLV port placement was 397 ± 263 days. Six DLV ports were removed due to infection and 1 for malfunction after a mean of 171 ± 120 days. Compared to temporary central venous and peripheral catheters, DLV port procedures had a greater rate of procedural complications, a longer duration, and a lower inlet speed (all P < 0.01). When accounting for the maximum allowable inlet speed to avoid citrate toxicity, 40% of DLV port procedures were greater than 10% below maximum speed, compared to 7 and 14% of procedures performed through temporary central venous and peripheral catheters (P < 0.0001). In conclusion, DLV ports can be used for RCE in adults with SCD, albeit with more procedural complications and longer duration. The smaller internal diameter and longer catheter of DLV ports compared to temporary central venous catheters likely accounts for the differences noted. J. Clin. Apheresis 30:353–358, 2015. © 2015 Wiley Periodicals, Inc.  相似文献   
70.
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