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   1347415篇
  免费   103520篇
  国内免费   4318篇
耳鼻咽喉   16914篇
儿科学   43971篇
妇产科学   36604篇
基础医学   199751篇
口腔科学   36411篇
临床医学   131032篇
内科学   260629篇
皮肤病学   26513篇
神经病学   113612篇
特种医学   48645篇
外国民族医学   366篇
外科学   186078篇
综合类   29143篇
现状与发展   1篇
一般理论   490篇
预防医学   115814篇
眼科学   29359篇
药学   99776篇
  7篇
中国医学   3180篇
肿瘤学   76957篇
  2021年   11059篇
  2019年   11832篇
  2018年   16506篇
  2017年   12477篇
  2016年   13432篇
  2015年   15407篇
  2014年   21129篇
  2013年   32554篇
  2012年   44931篇
  2011年   47739篇
  2010年   27507篇
  2009年   25293篇
  2008年   43410篇
  2007年   45778篇
  2006年   45871篇
  2005年   44311篇
  2004年   42203篇
  2003年   40151篇
  2002年   38952篇
  2001年   61251篇
  2000年   62976篇
  1999年   52655篇
  1998年   14779篇
  1997年   13464篇
  1996年   13288篇
  1995年   12584篇
  1994年   11760篇
  1993年   11064篇
  1992年   41842篇
  1991年   41003篇
  1990年   39701篇
  1989年   37542篇
  1988年   34831篇
  1987年   33889篇
  1986年   32336篇
  1985年   30824篇
  1984年   23200篇
  1983年   19727篇
  1982年   11878篇
  1979年   20953篇
  1978年   14932篇
  1977年   12159篇
  1976年   11974篇
  1975年   12180篇
  1974年   14910篇
  1973年   14573篇
  1972年   13433篇
  1971年   12495篇
  1970年   11539篇
  1969年   10456篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
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   
65.
66.
67.
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   
68.
69.
70.
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   
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