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   6242篇
  免费   365篇
  国内免费   40篇
耳鼻咽喉   54篇
儿科学   337篇
妇产科学   143篇
基础医学   681篇
口腔科学   98篇
临床医学   449篇
内科学   1337篇
皮肤病学   107篇
神经病学   337篇
特种医学   276篇
外科学   1242篇
综合类   178篇
一般理论   3篇
预防医学   267篇
眼科学   136篇
药学   531篇
中国医学   7篇
肿瘤学   464篇
  2023年   49篇
  2022年   72篇
  2021年   184篇
  2020年   91篇
  2019年   179篇
  2018年   197篇
  2017年   124篇
  2016年   141篇
  2015年   146篇
  2014年   244篇
  2013年   244篇
  2012年   389篇
  2011年   416篇
  2010年   216篇
  2009年   191篇
  2008年   321篇
  2007年   261篇
  2006年   277篇
  2005年   258篇
  2004年   248篇
  2003年   203篇
  2002年   188篇
  2001年   132篇
  2000年   145篇
  1999年   154篇
  1998年   62篇
  1997年   79篇
  1996年   69篇
  1995年   48篇
  1994年   38篇
  1993年   47篇
  1992年   104篇
  1991年   102篇
  1990年   78篇
  1989年   99篇
  1988年   76篇
  1987年   79篇
  1986年   73篇
  1985年   100篇
  1984年   48篇
  1983年   44篇
  1982年   25篇
  1981年   25篇
  1979年   25篇
  1975年   25篇
  1974年   34篇
  1973年   38篇
  1972年   27篇
  1969年   24篇
  1968年   27篇
排序方式: 共有6647条查询结果,搜索用时 15 毫秒
101.
102.
The present article reports a case involving an immunocompetent, previously well child who, despite two previous doses of inactivated poliovirus vaccine, developed severe flaccid paralysis consistent with polio after receiving oral polio vaccine.  相似文献   
103.
This study examined the extent to which racial disparities in service utilization exist in veterans (VA) and non-VA health care systems. An observational study design was used with a nationally representative sample of veterans. Logistic regression models were constructed using sociodemographic characteristics, health insurance and benefits, and health status as predictors of health service use in both VA and non-VA health care systems. A population weighted sample of 19,270 veterans from the 2001 National Survey of Veterans was used, which included 17,004 (88.24 %) White, 1,864 (9.15 %) African American, 414 (2.15 %) Native American/Alaskan Native, and 87 (0.45 %) Asian American/Pacific Islander veterans. Results showed that use of the VA health care system was not associated with race, but was associated with VA disability compensation, lack of private health insurance, and greater health care need. Contrarily, in non-VA healthcare systems, veterans who were racial minorities, less educated, and without private health insurance were less likely to use services. Together, these findings demonstrate the socioeconomic context in which health disparities exist and suggest the influence of health insurance on racial disparities in service utilization.  相似文献   
104.
105.
ABSTRACT:: A 52-year-old unvaccinated and splenectomized man presented with fever, altered sensorium, bilateral flank pain and chest discomfort accompanied with paroxysmal atrial fibrillation with a rapid ventricular response. An abdominal computed tomography scan was performed, which revealed a right renal infarct and splenosis. Transthoracic echocardiography was performed, which demonstrated an echodense structure on the mitral valve with mitral regurgitation and a vegetation on the aortic valve with aortic regurgitation. Subsequently, he was found to have pneumococcal infective endocarditis, pneumococcal pneumonia and bacterial meningitis, namely Austrian syndrome. He underwent an early aortic valve and mitral valve repair but still had a poor clinical outcome. Renal infarction has a mortality of approximately 13.2%, which is strongly influenced by the underlying diseases and infectious complications. Medical and surgical treatment initiated in a timely manner is often inadequate. The authors report the first case of Austrian syndrome presenting with renal infarction as a clue to an embolic event associated with infective endocarditis in this study.  相似文献   
106.
107.
108.
109.
110.
Google Internet query share (IQS) data for gastroenteritis-related search terms correlated strongly with contemporaneous national (R(2)?=?0.70) and regional (R(2)?=?0.74) norovirus surveillance data in the United States. IQS data may facilitate rapid identification of norovirus season onset, elevated peak activity, and potential emergence of novel strains.  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