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   524141篇
  免费   34908篇
  国内免费   623篇
耳鼻咽喉   6997篇
儿科学   17272篇
妇产科学   13886篇
基础医学   86696篇
口腔科学   14798篇
临床医学   45428篇
内科学   95755篇
皮肤病学   12273篇
神经病学   37354篇
特种医学   18968篇
外国民族医学   63篇
外科学   78180篇
综合类   8614篇
一般理论   125篇
预防医学   39970篇
眼科学   12313篇
药学   41262篇
中国医学   1022篇
肿瘤学   28696篇
  2018年   5124篇
  2016年   4261篇
  2015年   4713篇
  2014年   6312篇
  2013年   9950篇
  2012年   13433篇
  2011年   14920篇
  2010年   8625篇
  2009年   8087篇
  2008年   14233篇
  2007年   15186篇
  2006年   15436篇
  2005年   14836篇
  2004年   14513篇
  2003年   13812篇
  2002年   13664篇
  2001年   24449篇
  2000年   25446篇
  1999年   20915篇
  1998年   5573篇
  1997年   4837篇
  1996年   5153篇
  1995年   4746篇
  1994年   4451篇
  1992年   15965篇
  1991年   16569篇
  1990年   16629篇
  1989年   16013篇
  1988年   14779篇
  1987年   14588篇
  1986年   13753篇
  1985年   13115篇
  1984年   9753篇
  1983年   8357篇
  1982年   4619篇
  1981年   4309篇
  1979年   9503篇
  1978年   6924篇
  1977年   5849篇
  1976年   5660篇
  1975年   6472篇
  1974年   7722篇
  1973年   7190篇
  1972年   7017篇
  1971年   6754篇
  1970年   6225篇
  1969年   5936篇
  1968年   5599篇
  1967年   5049篇
  1966年   4497篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
PurposeUnderstanding the value of genetic screening and testing for monogenic disorders requires high-quality, methodologically robust economic evaluations. This systematic review sought to assess the methodological quality among such studies and examined opportunities for improvement.MethodsWe searched PubMed, Cochrane, Embase, and Web of Science for economic evaluations of genetic screening/testing (2013-2019). Methodological rigor and adherence to best practices were systematically assessed using the British Medical Journal checklist.ResultsAcross the 47 identified studies, there were substantial variations in modeling approaches, reporting detail, and sophistication. Models ranged from simple decision trees to individual-level microsimulations that compared between 2 and >20 alternative interventions. Many studies failed to report sufficient detail to enable replication or did not justify modeling assumptions, especially for costing methods and utility values. Meta-analyses, systematic reviews, or calibration were rarely used to derive parameter estimates. Nearly all studies conducted some sensitivity analysis, and more sophisticated studies implemented probabilistic sensitivity/uncertainty analysis, threshold analysis, and value of information analysis.ConclusionWe describe a heterogeneous body of work and present recommendations and exemplar studies across the methodological domains of (1) perspective, scope, and parameter selection; (2) use of uncertainty/sensitivity analyses; and (3) reporting transparency for improvement in the economic evaluation of genetic screening/testing.  相似文献   
2.
3.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36 weeks gestational age)...  相似文献   
4.
5.
6.
7.
8.
9.
10.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  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