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   3060071篇
  免费   227626篇
  国内免费   5970篇
耳鼻咽喉   43608篇
儿科学   95012篇
妇产科学   83203篇
基础医学   450361篇
口腔科学   85231篇
临床医学   275996篇
内科学   586292篇
皮肤病学   67422篇
神经病学   242645篇
特种医学   117933篇
外国民族医学   653篇
外科学   462127篇
综合类   67953篇
现状与发展   18篇
一般理论   1117篇
预防医学   238152篇
眼科学   72742篇
药学   230572篇
  11篇
中国医学   7267篇
肿瘤学   165352篇
  2021年   26336篇
  2019年   25825篇
  2018年   35269篇
  2017年   26712篇
  2016年   30345篇
  2015年   35305篇
  2014年   49007篇
  2013年   72157篇
  2012年   99791篇
  2011年   105029篇
  2010年   62357篇
  2009年   58152篇
  2008年   96834篇
  2007年   102975篇
  2006年   102874篇
  2005年   99884篇
  2004年   95566篇
  2003年   91591篇
  2002年   88105篇
  2001年   132364篇
  2000年   135445篇
  1999年   114136篇
  1998年   34058篇
  1997年   30063篇
  1996年   30067篇
  1995年   28360篇
  1994年   26290篇
  1993年   24749篇
  1992年   89614篇
  1991年   87767篇
  1990年   85683篇
  1989年   82563篇
  1988年   76348篇
  1987年   74794篇
  1986年   70267篇
  1985年   67650篇
  1984年   50954篇
  1983年   43491篇
  1982年   26375篇
  1979年   48138篇
  1978年   34560篇
  1977年   28864篇
  1976年   27457篇
  1975年   29559篇
  1974年   35853篇
  1973年   34144篇
  1972年   32270篇
  1971年   30290篇
  1970年   28240篇
  1969年   27130篇
排序方式: 共有10000条查询结果,搜索用时 70 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.
10.
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   
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