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   2405872篇
  免费   182326篇
  国内免费   5264篇
耳鼻咽喉   33202篇
儿科学   76143篇
妇产科学   66633篇
基础医学   342869篇
口腔科学   70729篇
临床医学   215224篇
内科学   464523篇
皮肤病学   52778篇
神经病学   189815篇
特种医学   92315篇
外国民族医学   411篇
外科学   369565篇
综合类   59105篇
现状与发展   6篇
一般理论   835篇
预防医学   182766篇
眼科学   57604篇
药学   177828篇
  7篇
中国医学   5662篇
肿瘤学   135442篇
  2018年   26435篇
  2017年   20232篇
  2016年   22369篇
  2015年   25541篇
  2014年   35996篇
  2013年   53194篇
  2012年   73204篇
  2011年   77100篇
  2010年   45369篇
  2009年   42328篇
  2008年   71853篇
  2007年   76966篇
  2006年   77164篇
  2005年   74423篇
  2004年   72070篇
  2003年   68731篇
  2002年   66196篇
  2001年   114976篇
  2000年   117572篇
  1999年   98126篇
  1998年   27291篇
  1997年   24197篇
  1996年   24058篇
  1995年   22978篇
  1994年   21332篇
  1993年   19866篇
  1992年   76517篇
  1991年   74166篇
  1990年   71776篇
  1989年   69105篇
  1988年   63682篇
  1987年   62349篇
  1986年   58863篇
  1985年   56384篇
  1984年   42359篇
  1983年   36142篇
  1982年   21430篇
  1981年   19409篇
  1979年   39162篇
  1978年   27642篇
  1977年   23458篇
  1976年   21726篇
  1975年   23185篇
  1974年   28240篇
  1973年   27232篇
  1972年   25607篇
  1971年   23756篇
  1970年   22303篇
  1969年   21109篇
  1968年   19461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