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   2699942篇
  免费   199668篇
  国内免费   7591篇
耳鼻咽喉   35342篇
儿科学   88626篇
妇产科学   73453篇
基础医学   388123篇
口腔科学   77113篇
临床医学   252232篇
内科学   521699篇
皮肤病学   58321篇
神经病学   215863篇
特种医学   100056篇
外国民族医学   594篇
外科学   395102篇
综合类   62593篇
现状与发展   6篇
一般理论   948篇
预防医学   214541篇
眼科学   62817篇
药学   198837篇
  16篇
中国医学   7165篇
肿瘤学   153754篇
  2021年   21334篇
  2019年   22251篇
  2018年   31827篇
  2017年   24156篇
  2016年   26447篇
  2015年   30183篇
  2014年   41809篇
  2013年   62534篇
  2012年   86203篇
  2011年   91129篇
  2010年   53827篇
  2009年   49923篇
  2008年   84047篇
  2007年   89181篇
  2006年   89762篇
  2005年   86084篇
  2004年   82596篇
  2003年   78598篇
  2002年   76080篇
  2001年   131372篇
  2000年   134682篇
  1999年   112203篇
  1998年   30706篇
  1997年   27140篇
  1996年   27049篇
  1995年   25860篇
  1994年   23961篇
  1993年   22241篇
  1992年   86793篇
  1991年   84221篇
  1990年   81151篇
  1989年   77692篇
  1988年   71317篇
  1987年   69688篇
  1986年   66065篇
  1985年   62852篇
  1984年   46706篇
  1983年   39786篇
  1982年   23029篇
  1979年   41806篇
  1978年   29323篇
  1977年   24534篇
  1976年   23320篇
  1975年   24297篇
  1974年   29578篇
  1973年   28692篇
  1972年   26613篇
  1971年   24688篇
  1970年   22957篇
  1969年   21265篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Past research suggests that as many as 50% of onward human immunodeficiency virus (HIV) transmissions occur during acute and recent HIV infection. It is clearly important to develop interventions which focus on this highly infectious stage of HIV infection to prevent further transmission in the risk networks of acutely and recently infected individuals. Project Protect tries to find recently and acutely infected individuals and prevents HIV transmission in their risk networks. Participants are recruited by community health outreach workers at community-based HIV testing sites and drug users' community venues, by coupon referrals and through referrals from AIDS clinics. When a network with acute/recent infection is identified, network members are interviewed about their risky behaviors, network information is collected, and blood is drawn for HIV testing. Participants are also educated and given prevention materials (condoms, syringes, educational materials); HIV-infected participants are referred to AIDS clinics and are assisted with access to care. Community alerts about elevated risk of HIV transmission are distributed within the risk networks of recently infected. Overall, 342 people were recruited to the project and screened for acute/recent HIV infection. Only six index cases of recent infection (2.3% of all people screened) were found through primary screening at voluntary counseling and testing (VCT) sites, but six cases of recent infection were found through contact tracing of these recently infected participants (7% of network members who came to the interview). Combining screening at VCT sites and contact tracing the number of recently infected people we located as compared to VCT screening alone. No adverse events were encountered. These first results provide evidence for the theory behind the intervention, i.e., in the risk networks of recently infected people there are other people with recent HIV infection and they can be successfully located without increasing stigma for project participants.  相似文献   
102.
103.
The value of adding simeprevir (SMV) vs placebo (PBO) to peginterferon and ribavirin (PR) for treatment of chronic hepatitis C virus infection was examined using patient‐reported outcomes (PROs); further, concordance of PROs with virology endpoints and adverse events (AEs) was explored. Patients (= 768 SMV/PR,= 393 PBO/PR) rated fatigue (FSS), depressive symptoms (CES‐D) and functional impairment (WPAI: Hepatitis C Productivity, Daily Activity and Absenteeism) at baseline and throughout treatment in three randomised, double‐blind trials comparing the addition of SMV or PBO during initial 12 weeks of PR. PR was administered for 48 weeks (PBO group) and 24/48 weeks (SMV group) using a response‐guided therapy (RGT) approach. Mean PRO scores (except Absenteeism) worsened from baseline to Week 4 to the same extent in both groups but reverted after Week 24 for SMV/PR and only after Week 48 for PBO/PR. Accordingly, there was a significantly lower area under the curve (baseline–Week 60, AUC60) and fewer weeks with clinically important worsening of scores in the SMV/PR group at any time point. Incidences of patients with fatigue and anaemia AEs were similar in both groups, but FSS scores showed that clinically important increases in fatigue lasted a mean of 6.9 weeks longer with PBO/PR (P < 0.001). PRO score subgroup analysis indicated better outcomes for patients who met the criteria for RGT or achieved sustained virological response 12 weeks post‐treatment (SVR12); differences in mean PRO scores associated with fibrosis level were only observed with PBO/PR. Greater efficacy of SMV/PR enabled reduced treatment duration and reduced time with PR‐related AEs without adding to AE severity.  相似文献   
104.
105.
European Journal of Orthopaedic Surgery & Traumatology - The goals of this study were to compare patient satisfaction and wound-related complications in patients receiving 2-octyl cyanoacrylate...  相似文献   
106.
107.
108.
Annals of Nuclear Medicine - The Response Evaluation Criteria In Solid Tumors (RECIST) is the most used radiological method for evaluating response after peptide receptor radionuclide therapy...  相似文献   
109.
110.
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