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   2991875篇
  免费   224570篇
  国内免费   4998篇
耳鼻咽喉   42239篇
儿科学   94530篇
妇产科学   81436篇
基础医学   440932篇
口腔科学   83938篇
临床医学   269243篇
内科学   573435篇
皮肤病学   64788篇
神经病学   239361篇
特种医学   113884篇
外国民族医学   665篇
外科学   452937篇
综合类   66681篇
现状与发展   13篇
一般理论   1116篇
预防医学   237441篇
眼科学   70529篇
药学   222811篇
  10篇
中国医学   5923篇
肿瘤学   159531篇
  2019年   23936篇
  2018年   33000篇
  2017年   25134篇
  2016年   27986篇
  2015年   31841篇
  2014年   45077篇
  2013年   67580篇
  2012年   93071篇
  2011年   98669篇
  2010年   58321篇
  2009年   55253篇
  2008年   92644篇
  2007年   98985篇
  2006年   99494篇
  2005年   96616篇
  2004年   92618篇
  2003年   89176篇
  2002年   86172篇
  2001年   131569篇
  2000年   134856篇
  1999年   113796篇
  1998年   33951篇
  1997年   29968篇
  1996年   30027篇
  1995年   28272篇
  1994年   26297篇
  1993年   24728篇
  1992年   89711篇
  1991年   87839篇
  1990年   85880篇
  1989年   82663篇
  1988年   76469篇
  1987年   74901篇
  1986年   70403篇
  1985年   67769篇
  1984年   51057篇
  1983年   43542篇
  1982年   26341篇
  1979年   48222篇
  1978年   34563篇
  1977年   28818篇
  1976年   27420篇
  1975年   29552篇
  1974年   35856篇
  1973年   34156篇
  1972年   32271篇
  1971年   30355篇
  1970年   28262篇
  1969年   27142篇
  1968年   24761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