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   3053906篇
  免费   231046篇
  国内免费   11378篇
耳鼻咽喉   42768篇
儿科学   94632篇
妇产科学   82928篇
基础医学   443745篇
口腔科学   84845篇
临床医学   279211篇
内科学   581366篇
皮肤病学   65268篇
神经病学   238874篇
特种医学   115478篇
外国民族医学   692篇
外科学   458025篇
综合类   85483篇
现状与发展   33篇
一般理论   1070篇
预防医学   239534篇
眼科学   72788篇
药学   231805篇
  125篇
中国医学   12244篇
肿瘤学   165416篇
  2021年   27355篇
  2019年   26342篇
  2018年   35381篇
  2017年   27576篇
  2016年   29939篇
  2015年   35436篇
  2014年   49622篇
  2013年   71716篇
  2012年   98856篇
  2011年   105140篇
  2010年   63440篇
  2009年   58977篇
  2008年   96694篇
  2007年   102862篇
  2006年   103085篇
  2005年   99917篇
  2004年   94544篇
  2003年   90918篇
  2002年   87367篇
  2001年   132498篇
  2000年   135566篇
  1999年   114538篇
  1998年   34376篇
  1997年   30480篇
  1996年   30344篇
  1995年   28658篇
  1994年   26648篇
  1993年   24777篇
  1992年   89402篇
  1991年   87483篇
  1990年   85502篇
  1989年   82272篇
  1988年   76085篇
  1987年   74533篇
  1986年   69995篇
  1985年   67361篇
  1984年   50713篇
  1983年   43271篇
  1982年   26201篇
  1979年   47950篇
  1978年   34400篇
  1977年   28671篇
  1976年   27294篇
  1975年   29427篇
  1974年   35709篇
  1973年   34011篇
  1972年   32122篇
  1971年   30194篇
  1970年   28132篇
  1969年   27041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.
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