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   2352728篇
  免费   179132篇
  国内免费   5071篇
耳鼻咽喉   32299篇
儿科学   74601篇
妇产科学   65646篇
基础医学   336825篇
口腔科学   69514篇
临床医学   209802篇
内科学   454202篇
皮肤病学   51902篇
神经病学   184551篇
特种医学   90495篇
外国民族医学   406篇
外科学   360476篇
综合类   58499篇
现状与发展   6篇
一般理论   751篇
预防医学   178105篇
眼科学   56497篇
药学   174431篇
  7篇
中国医学   5572篇
肿瘤学   132344篇
  2018年   25099篇
  2017年   19286篇
  2016年   21346篇
  2015年   24489篇
  2014年   34366篇
  2013年   50794篇
  2012年   69675篇
  2011年   73427篇
  2010年   43304篇
  2009年   40524篇
  2008年   68577篇
  2007年   73463篇
  2006年   73758篇
  2005年   71054篇
  2004年   68896篇
  2003年   65753篇
  2002年   63463篇
  2001年   114617篇
  2000年   117225篇
  1999年   97677篇
  1998年   26758篇
  1997年   23698篇
  1996年   23623篇
  1995年   22585篇
  1994年   20963篇
  1993年   19552篇
  1992年   76257篇
  1991年   73921篇
  1990年   71575篇
  1989年   68899篇
  1988年   63475篇
  1987年   62160篇
  1986年   58665篇
  1985年   56108篇
  1984年   42043篇
  1983年   35855篇
  1982年   21034篇
  1981年   19027篇
  1979年   39008篇
  1978年   27429篇
  1977年   23255篇
  1976年   21565篇
  1975年   23010篇
  1974年   28111篇
  1973年   27097篇
  1972年   25482篇
  1971年   23640篇
  1970年   22206篇
  1969年   21024篇
  1968年   19387篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Molnár  B.  Aroca  S.  Dobos  A.  Orbán  K.  Szabó  J.  Windisch  P.  Stähli  A.  Sculean  A. 《Clinical oral investigations》2022,26(12):7135-7142
Clinical Oral Investigations - To evaluate t he long-term outcomes following treatment of RT 1 multiple adjacent gingival recessions (MAGR) using the modified coronally advanced tunnel (MCAT) with...  相似文献   
2.

Physical activity brings significant health benefits to middle-aged adults, although the research to date has been focused on late adulthood. This study aims to examine how ageing affects the self-reported and accelerometer-derived measures of physical activity levels in middle-aged adults. We employed the data recorded in the UK Biobank and analysed the physical activity levels of 2,998 participants (1381 men and 1617 women), based on self-completion questionnaire and accelerometry measurement of physical activity. We also assessed the musculoskeletal health of the participants using the dual-energy X-ray absorptiometry (DXA) measurements provided by the UK Biobank. Participants were categorised into three groups according to their age: group I younger middle-aged (40 to 49 years), group II older middle-aged (50 to 59 years), and group III oldest middle-aged (60 to 69 years). Self-reported physical activity level increased with age and was the highest in group III, followed by group II and I (P?<?0.05). On the contrary, physical activity measured by accelerometry decreased significantly with age from group I to III (P?<?0.05), and the same pertained to the measurements of musculoskeletal health (P?<?0.05). It was also shown that middle-aged adults mostly engaged in low and moderate intensity activities. The opposing trends of the self-reported and measured physical activity levels may suggest that middle-aged adults over-report their activity level as they age. They should be aware of the difference between their perceived and actual physical activity levels, and objective measures would be useful to prevent the decline in musculoskeletal health.

  相似文献   
3.
Die Anaesthesiologie - Auch wenn für Anästhesiologen über Jahrzehnte die Prophylaxe und Therapie postoperativer Schmerzen im Rahmen des postoperativen Patientenkomforts an vorderster...  相似文献   
4.
5.
6.
7.
8.
9.
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   
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