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   2935447篇
  免费   220810篇
  国内免费   4869篇
耳鼻咽喉   41729篇
儿科学   92817篇
妇产科学   80256篇
基础医学   431972篇
口腔科学   82447篇
临床医学   264138篇
内科学   563016篇
皮肤病学   63852篇
神经病学   233342篇
特种医学   111706篇
外国民族医学   653篇
外科学   446253篇
综合类   66413篇
现状与发展   13篇
一般理论   1054篇
预防医学   230490篇
眼科学   69547篇
药学   219321篇
  10篇
中国医学   5808篇
肿瘤学   156289篇
  2018年   31754篇
  2017年   24115篇
  2016年   26890篇
  2015年   30544篇
  2014年   43294篇
  2013年   65223篇
  2012年   89505篇
  2011年   95030篇
  2010年   56349篇
  2009年   53186篇
  2008年   89502篇
  2007年   95734篇
  2006年   96328篇
  2005年   93741篇
  2004年   90206篇
  2003年   86951篇
  2002年   84087篇
  2001年   130170篇
  2000年   133436篇
  1999年   112470篇
  1998年   33207篇
  1997年   29379篇
  1996年   29459篇
  1995年   27807篇
  1994年   25836篇
  1993年   24343篇
  1992年   88803篇
  1991年   86952篇
  1990年   85022篇
  1989年   81894篇
  1988年   75726篇
  1987年   74243篇
  1986年   69753篇
  1985年   67177篇
  1984年   50598篇
  1983年   43173篇
  1982年   26141篇
  1981年   23679篇
  1979年   47873篇
  1978年   34338篇
  1977年   28621篇
  1976年   27267篇
  1975年   29402篇
  1974年   35655篇
  1973年   33975篇
  1972年   32079篇
  1971年   30167篇
  1970年   28104篇
  1969年   27024篇
  1968年   24605篇
排序方式: 共有10000条查询结果,搜索用时 93 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