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   2946101篇
  免费   221501篇
  国内免费   4886篇
耳鼻咽喉   41804篇
儿科学   93100篇
妇产科学   80536篇
基础医学   433182篇
口腔科学   82780篇
临床医学   265529篇
内科学   565265篇
皮肤病学   64048篇
神经病学   234227篇
特种医学   112080篇
外国民族医学   653篇
外科学   447334篇
综合类   66712篇
现状与发展   13篇
一般理论   1066篇
预防医学   231905篇
眼科学   69676篇
药学   219934篇
  11篇
中国医学   5816篇
肿瘤学   156817篇
  2018年   31940篇
  2017年   24246篇
  2016年   27026篇
  2015年   30668篇
  2014年   43506篇
  2013年   65563篇
  2012年   89918篇
  2011年   95499篇
  2010年   56624篇
  2009年   53415篇
  2008年   89886篇
  2007年   96109篇
  2006年   96687篇
  2005年   94098篇
  2004年   90557篇
  2003年   87314篇
  2002年   84455篇
  2001年   130388篇
  2000年   133681篇
  1999年   112669篇
  1998年   33328篇
  1997年   29470篇
  1996年   29571篇
  1995年   27875篇
  1994年   25900篇
  1993年   24415篇
  1992年   88956篇
  1991年   87085篇
  1990年   85158篇
  1989年   82025篇
  1988年   75846篇
  1987年   74365篇
  1986年   69870篇
  1985年   67315篇
  1984年   50736篇
  1983年   43276篇
  1982年   26196篇
  1981年   23731篇
  1979年   47958篇
  1978年   34398篇
  1977年   28674篇
  1976年   27335篇
  1975年   29475篇
  1974年   35724篇
  1973年   34037篇
  1972年   32141篇
  1971年   30229篇
  1970年   28141篇
  1969年   27067篇
  1968年   24667篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Quality of Life Research - The COVID-19 pandemic might add to the stressors experienced by people living with rheumatic diseases. This study aimed to examine rheumatic patients’ functional...  相似文献   
2.
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   
3.

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   
4.
5.
6.
Journal of Medical Ultrasonics - Chronic liver disease is still a major problem because disease progression will ultimately lead to liver cirrhosis. Portal hypertension is the hallmark in advanced...  相似文献   
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