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   1366992篇
  免费   103904篇
  国内免费   4409篇
耳鼻咽喉   17175篇
儿科学   44431篇
妇产科学   37102篇
基础医学   202595篇
口腔科学   37814篇
临床医学   132221篇
内科学   265796篇
皮肤病学   27161篇
神经病学   115025篇
特种医学   48842篇
外国民族医学   366篇
外科学   187520篇
综合类   28926篇
现状与发展   1篇
一般理论   475篇
预防医学   117851篇
眼科学   29453篇
药学   101234篇
  6篇
中国医学   3335篇
肿瘤学   77976篇
  2021年   12015篇
  2019年   12617篇
  2018年   17672篇
  2017年   13214篇
  2016年   14230篇
  2015年   16343篇
  2014年   22090篇
  2013年   33682篇
  2012年   46985篇
  2011年   49944篇
  2010年   28627篇
  2009年   26051篇
  2008年   44924篇
  2007年   47354篇
  2006年   47189篇
  2005年   45541篇
  2004年   43281篇
  2003年   41005篇
  2002年   39717篇
  2001年   61210篇
  2000年   62884篇
  1999年   52583篇
  1998年   14755篇
  1997年   13410篇
  1996年   13210篇
  1995年   12549篇
  1994年   11698篇
  1993年   10989篇
  1992年   41743篇
  1991年   40891篇
  1990年   39560篇
  1989年   37434篇
  1988年   34652篇
  1987年   33765篇
  1986年   32224篇
  1985年   30695篇
  1984年   23082篇
  1983年   19642篇
  1982年   11776篇
  1979年   20834篇
  1978年   14838篇
  1977年   12080篇
  1976年   11891篇
  1975年   12140篇
  1974年   14845篇
  1973年   14494篇
  1972年   13381篇
  1971年   12449篇
  1970年   11511篇
  1969年   10439篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
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   
63.
64.
65.
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   
66.
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