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   2968491篇
  免费   222757篇
  国内免费   5000篇
耳鼻咽喉   42087篇
儿科学   93647篇
妇产科学   80780篇
基础医学   436196篇
口腔科学   83326篇
临床医学   267390篇
内科学   569667篇
皮肤病学   64380篇
神经病学   236632篇
特种医学   113459篇
外国民族医学   659篇
外科学   450824篇
综合类   66799篇
现状与发展   13篇
一般理论   1074篇
预防医学   233409篇
眼科学   70302篇
药学   221370篇
  11篇
中国医学   5859篇
肿瘤学   158364篇
  2018年   32370篇
  2017年   24617篇
  2016年   27459篇
  2015年   31225篇
  2014年   44263篇
  2013年   66599篇
  2012年   91508篇
  2011年   97209篇
  2010年   57609篇
  2009年   54304篇
  2008年   91564篇
  2007年   97850篇
  2006年   98426篇
  2005年   95712篇
  2004年   92078篇
  2003年   88790篇
  2002年   85867篇
  2001年   130513篇
  2000年   133752篇
  1999年   112822篇
  1998年   33600篇
  1997年   29694篇
  1996年   29735篇
  1995年   28064篇
  1994年   26035篇
  1993年   24518篇
  1992年   88987篇
  1991年   87149篇
  1990年   85172篇
  1989年   82060篇
  1988年   75882篇
  1987年   74413篇
  1986年   69894篇
  1985年   67351篇
  1984年   50785篇
  1983年   43336篇
  1982年   26340篇
  1981年   23862篇
  1979年   48001篇
  1978年   34482篇
  1977年   28747篇
  1976年   27374篇
  1975年   29518篇
  1974年   35764篇
  1973年   34052篇
  1972年   32152篇
  1971年   30223篇
  1970年   28167篇
  1969年   27069篇
  1968年   24654篇
排序方式: 共有10000条查询结果,搜索用时 31 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