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   1335157篇
  免费   102278篇
  国内免费   4313篇
耳鼻咽喉   16858篇
儿科学   43615篇
妇产科学   36404篇
基础医学   198060篇
口腔科学   35942篇
临床医学   129729篇
内科学   258507篇
皮肤病学   26397篇
神经病学   112039篇
特种医学   48226篇
外国民族医学   366篇
外科学   184299篇
综合类   28891篇
现状与发展   1篇
一般理论   461篇
预防医学   114439篇
眼科学   29012篇
药学   98974篇
  7篇
中国医学   3210篇
肿瘤学   76311篇
  2021年   10955篇
  2019年   11698篇
  2018年   16389篇
  2017年   12351篇
  2016年   13331篇
  2015年   15278篇
  2014年   20897篇
  2013年   32193篇
  2012年   44384篇
  2011年   47021篇
  2010年   27177篇
  2009年   25007篇
  2008年   42822篇
  2007年   45141篇
  2006年   45260篇
  2005年   43683篇
  2004年   41655篇
  2003年   39588篇
  2002年   38379篇
  2001年   60861篇
  2000年   62543篇
  1999年   52293篇
  1998年   14592篇
  1997年   13290篇
  1996年   13128篇
  1995年   12468篇
  1994年   11637篇
  1993年   10929篇
  1992年   41579篇
  1991年   40764篇
  1990年   39445篇
  1989年   37345篇
  1988年   34583篇
  1987年   33696篇
  1986年   32153篇
  1985年   30641篇
  1984年   23039篇
  1983年   19593篇
  1982年   11752篇
  1979年   20813篇
  1978年   14816篇
  1977年   12065篇
  1976年   11878篇
  1975年   12118篇
  1974年   14801篇
  1973年   14477篇
  1972年   13358篇
  1971年   12423篇
  1970年   11485篇
  1969年   10413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