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   1460294篇
  免费   107039篇
  国内免费   4544篇
耳鼻咽喉   18467篇
儿科学   47012篇
妇产科学   39339篇
基础医学   216195篇
口腔科学   40467篇
临床医学   137095篇
内科学   285574篇
皮肤病学   29846篇
神经病学   122410篇
特种医学   51283篇
外国民族医学   367篇
外科学   198033篇
综合类   29388篇
现状与发展   1篇
一般理论   483篇
预防医学   129744篇
眼科学   32526篇
药学   108944篇
  6篇
中国医学   3662篇
肿瘤学   81035篇
  2021年   12814篇
  2019年   13807篇
  2018年   20181篇
  2017年   14720篇
  2016年   15669篇
  2015年   17893篇
  2014年   23762篇
  2013年   36579篇
  2012年   52362篇
  2011年   55482篇
  2010年   31246篇
  2009年   27918篇
  2008年   49761篇
  2007年   52625篇
  2006年   52403篇
  2005年   50484篇
  2004年   47865篇
  2003年   45357篇
  2002年   43865篇
  2001年   64122篇
  2000年   66165篇
  1999年   55034篇
  1998年   15086篇
  1997年   13591篇
  1996年   13436篇
  1995年   12747篇
  1994年   11850篇
  1993年   11114篇
  1992年   43109篇
  1991年   42109篇
  1990年   40827篇
  1989年   38557篇
  1988年   35736篇
  1987年   34806篇
  1986年   33242篇
  1985年   31646篇
  1984年   23782篇
  1983年   20234篇
  1982年   12068篇
  1979年   21713篇
  1978年   15418篇
  1977年   12661篇
  1976年   12452篇
  1975年   12783篇
  1974年   15684篇
  1973年   15368篇
  1972年   14237篇
  1971年   13253篇
  1970年   12265篇
  1969年   11250篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
71.
72.
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   
73.
74.
75.
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   
76.
77.
78.
79.
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   
80.
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