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   110241篇
  免费   7849篇
  国内免费   398篇
耳鼻咽喉   1273篇
儿科学   2681篇
妇产科学   1958篇
基础医学   16081篇
口腔科学   2363篇
临床医学   11035篇
内科学   23077篇
皮肤病学   1944篇
神经病学   11524篇
特种医学   4565篇
外国民族医学   7篇
外科学   16015篇
综合类   1378篇
一般理论   75篇
预防医学   8150篇
眼科学   1929篇
药学   7305篇
中国医学   119篇
肿瘤学   7009篇
  2023年   597篇
  2022年   1120篇
  2021年   2237篇
  2020年   1362篇
  2019年   2055篇
  2018年   2526篇
  2017年   1881篇
  2016年   2250篇
  2015年   2619篇
  2014年   3421篇
  2013年   4515篇
  2012年   7016篇
  2011年   7093篇
  2010年   4180篇
  2009年   3832篇
  2008年   6329篇
  2007年   6818篇
  2006年   6311篇
  2005年   6310篇
  2004年   5900篇
  2003年   5304篇
  2002年   5235篇
  2001年   2055篇
  2000年   1928篇
  1999年   1804篇
  1998年   1289篇
  1997年   1072篇
  1996年   880篇
  1995年   872篇
  1994年   743篇
  1993年   669篇
  1992年   1202篇
  1991年   1145篇
  1990年   1068篇
  1989年   1024篇
  1988年   927篇
  1987年   862篇
  1986年   881篇
  1985年   874篇
  1984年   709篇
  1983年   609篇
  1982年   596篇
  1981年   481篇
  1980年   429篇
  1979年   554篇
  1978年   434篇
  1977年   409篇
  1975年   371篇
  1974年   406篇
  1973年   393篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
The current study explored the influence of three methods of parental emotion discourse (structured story-telling, reminiscing, and picture book) and their relation to preschoolers’ emotion understanding. Thirty-seven families participated in the study. Analyses showed that the structured story-telling method produced more emotion words, was high in unique emotion words, and was high for both emotion labelling and explanations. All three methods showed some potential to predict preschooler’s emotion understanding. Structured story-telling was best at predicting role-taking, while reminiscing and the picture book both were better at predicting situation knowledge. Additional studies are needed to further explore the influence of different methods of assessing emotion discourse to enhance validity and reliability of research in this field.  相似文献   
2.
3.
4.
Major ursodeoxycholic acid (UDCA)-based therapies for primary biliary cirrhosis (PBC) include UDCA only, or combined with either methotrexate (MTX), corticosteroids (COT), colchicine (COC), or bezafibrate (BEF). As the optimum treatment regimen is unclear and warrants exploration, we aimed to compare these therapies in terms of patient mortality or liver transplantation (MOLT) and adverse events (AE).PubMed, the Cochrane Library, and Scopus were searched for randomized controlled trials up to August 31, 2014. We estimated the hazard ratios (HRs) for MOLT and odds ratios (ORs) for AE. A sensitivity analysis based on the dose of UDCA was also executed.Thirty-one eligible articles were included. Compared with COT plus UDCA, UDCA (HR 0.38, 95% confidence interval [CI] 0.09–1.39), BEF plus UDCA (HR 0.29, 95% CI 0.02–4.83), COC plus UDCA (HR 0.39, 95% CI 0.07–2.25), MTX plus UDCA (HR 0.28, 95% CI 0.05–1.63), or OBS (HR 0.49, 95% CI 0.11–2.01) all provided an increased risk of MOLT. With respect to drug AE profile, although not differing appreciably, BEF plus UDCA was associated with more AEs compared with UDCA (OR 3.16, 95% CI 0.59–20.67), COT plus UDCA (OR 2.27, 95% CI 0.15–33.36), COC plus UDCA (OR 1.00, 95% CI 0.09–12.16), MTX plus UDCA (OR 2.03, 95% CI 0.23–17.82), or OBS (OR 3.00, 95% CI 0.53–20.75). The results of sensitivity analyses were highly consistent with previous analyses.COT plus UDCA was the optimal UDCA-based regimen for both MOLT and AEs. BEF plus UDCA was most likely to cause AEs, whereas monotherapy with UDCA and coadministriation of COT plus UDCA appeared to be associated with the fewest AEs for PBC treatment.  相似文献   
5.
BackgroundThe aim of this paper is to assess the current state of quality and outcomes measures being reported for hepatic resections in the recent literature.MethodsMedline and PubMed databases were searched for English language articles published between 1 January 2002 and 30 April 2013. Two examiners reviewed each article and relevant citations for appropriateness of inclusion, which excluded papers of liver donor hepatic resections, repeat hepatectomies or meta-analyses. Data were extracted and summarized by two examiners for analysis.ResultsFifty-five studies were identified with suitable reporting to assess peri-operative mortality in hepatic resections. In only 35% (19/55) of the studies was the follow-up time explicitly stated, and in 47% (26/55) of studies peri-operative mortality was limited to in-hospital or 30 days. The time period in which complications were captured was not explicitly stated in 19 out of 28 studies. The remaining studies only captured complications within 30 days of the index operation (8/28). There was a paucity of quality literature addressing truly patient-centred outcomes.ConclusionQuality outcomes after a hepatic resection are inconsistently reported in the literature. Quality outcome studies for a hepatectomy should report mortality and morbidity at a minimum of 90 days after surgery.  相似文献   
6.
7.
8.
9.
10.
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