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   2064683篇
  免费   160609篇
  国内免费   5996篇
耳鼻咽喉   28566篇
儿科学   64162篇
妇产科学   57455篇
基础医学   303543篇
口腔科学   57760篇
临床医学   193684篇
内科学   394450篇
皮肤病学   42145篇
神经病学   171098篇
特种医学   78865篇
外国民族医学   531篇
外科学   298476篇
综合类   49602篇
现状与发展   4篇
一般理论   705篇
预防医学   171447篇
眼科学   47328篇
药学   154246篇
  6篇
中国医学   4804篇
肿瘤学   112411篇
  2018年   22990篇
  2017年   17516篇
  2016年   19581篇
  2015年   22839篇
  2014年   31557篇
  2013年   47728篇
  2012年   65308篇
  2011年   68859篇
  2010年   40257篇
  2009年   37062篇
  2008年   62883篇
  2007年   66802篇
  2006年   66582篇
  2005年   64857篇
  2004年   62223篇
  2003年   59317篇
  2002年   57350篇
  2001年   88006篇
  2000年   90187篇
  1999年   76107篇
  1998年   22396篇
  1997年   20413篇
  1996年   20038篇
  1995年   19009篇
  1994年   17970篇
  1993年   16848篇
  1992年   62114篇
  1991年   60845篇
  1990年   59332篇
  1989年   56627篇
  1988年   52874篇
  1987年   51845篇
  1986年   49336篇
  1985年   47426篇
  1984年   36186篇
  1983年   30941篇
  1982年   19079篇
  1981年   17180篇
  1979年   34603篇
  1978年   24840篇
  1977年   20602篇
  1976年   19707篇
  1975年   20666篇
  1974年   25496篇
  1973年   24744篇
  1972年   23209篇
  1971年   21578篇
  1970年   20213篇
  1969年   19090篇
  1968年   17628篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
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   
83.
84.
85.
86.
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   
87.
88.
89.
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   
90.
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