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   2933178篇
  免费   220678篇
  国内免费   4860篇
耳鼻咽喉   41711篇
儿科学   92794篇
妇产科学   80226篇
基础医学   431708篇
口腔科学   82400篇
临床医学   263784篇
内科学   562423篇
皮肤病学   63839篇
神经病学   233206篇
特种医学   111657篇
外国民族医学   653篇
外科学   446067篇
综合类   66335篇
现状与发展   13篇
一般理论   1053篇
预防医学   230232篇
眼科学   69466篇
药学   219210篇
  9篇
中国医学   5807篇
肿瘤学   156123篇
  2018年   31721篇
  2017年   24092篇
  2016年   26868篇
  2015年   30513篇
  2014年   43268篇
  2013年   65182篇
  2012年   89444篇
  2011年   94989篇
  2010年   56313篇
  2009年   53141篇
  2008年   89446篇
  2007年   95686篇
  2006年   96278篇
  2005年   93691篇
  2004年   90145篇
  2003年   86917篇
  2002年   84057篇
  2001年   130130篇
  2000年   133408篇
  1999年   112428篇
  1998年   33195篇
  1997年   29371篇
  1996年   29448篇
  1995年   27794篇
  1994年   25827篇
  1993年   24336篇
  1992年   88777篇
  1991年   86924篇
  1990年   85003篇
  1989年   81871篇
  1988年   75705篇
  1987年   74227篇
  1986年   69734篇
  1985年   67161篇
  1984年   50589篇
  1983年   43154篇
  1982年   26133篇
  1981年   23676篇
  1979年   47858篇
  1978年   34325篇
  1977年   28616篇
  1976年   27257篇
  1975年   29390篇
  1974年   35650篇
  1973年   33957篇
  1972年   32065篇
  1971年   30158篇
  1970年   28095篇
  1969年   27011篇
  1968年   24598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