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   1936615篇
  免费   140423篇
  国内免费   4404篇
耳鼻咽喉   25585篇
儿科学   63733篇
妇产科学   53461篇
基础医学   277906篇
口腔科学   55332篇
临床医学   171541篇
内科学   378843篇
皮肤病学   44635篇
神经病学   148723篇
特种医学   74164篇
外国民族医学   282篇
外科学   293999篇
综合类   44993篇
现状与发展   5篇
一般理论   670篇
预防医学   140964篇
眼科学   46157篇
药学   141919篇
  7篇
中国医学   5406篇
肿瘤学   113117篇
  2021年   15504篇
  2019年   15765篇
  2018年   23217篇
  2017年   17637篇
  2016年   19725篇
  2015年   22714篇
  2014年   31033篇
  2013年   44981篇
  2012年   61756篇
  2011年   64802篇
  2010年   38746篇
  2009年   36038篇
  2008年   59498篇
  2007年   63211篇
  2006年   63393篇
  2005年   60316篇
  2004年   58010篇
  2003年   55022篇
  2002年   52714篇
  2001年   100568篇
  2000年   102739篇
  1999年   84723篇
  1998年   22082篇
  1997年   19389篇
  1996年   19309篇
  1995年   18578篇
  1994年   17027篇
  1993年   15702篇
  1992年   63290篇
  1991年   61290篇
  1990年   58957篇
  1989年   56629篇
  1988年   51450篇
  1987年   50099篇
  1986年   47292篇
  1985年   44840篇
  1984年   32937篇
  1983年   28012篇
  1982年   15802篇
  1979年   29016篇
  1978年   20103篇
  1977年   17121篇
  1976年   15861篇
  1975年   16899篇
  1974年   20347篇
  1973年   19691篇
  1972年   18263篇
  1971年   16874篇
  1970年   15790篇
  1969年   14638篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
82.
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   
83.
84.
85.
86.
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   
87.
88.

Purpose

Chest wall pain is an uncommon but bothersome late complication following lung stereotactic body radiation therapy. Despite numerous studies investigating predictors of chest wall pain, no clear consensus has been established for a chest wall constraint. The aim of our study was to investigate factors related to chest wall pain in a homogeneous group of patients treated at our institution.

Patients and methods

All 122 patients were treated with the same stereotactic body radiation therapy regimen of 48 Gy in three fractions, seen for at least 6 months of follow-up, and planned with heterogeneity correction. Chest wall pain was scored according to the Common Terminology Criteria for Adverse Events classification v3.0. Patient (age, sex, diabetes, osteoporosis), tumour (planning target volume, volume of the overlapping region between planning target volume and chest wall) and chest wall dosimetric parameters (volumes receiving at least 30, 40, and 50 Gy, the minimal doses received by the highest irradiated 1, 2, and 5 cm3, and maximum dose) were collected. The correlation between chest wall pain (grade 2 or higher) and the different parameters was evaluated using univariate and multivariate logistic regression.

Results

Median follow-up was 18 months (range: 6–56 months). Twelve patients out of 122 developed chest wall pain of any grade (seven with grade 1, three with grade 2 and two with grade 3 pain). In univariate analysis, only the volume receiving 30 Gy or more (P = 0.034) and the volume of the overlapping region between the planning target volume and chest wall (P = 0.038) significantly predicted chest wall pain, but these variables were later proved non-significant in multivariate regression.

Conclusion

Our analysis could not find any correlation between the studied parameters and chest wall pain. Considering our present study and the wide range of differing results from the literature, a reasonable conclusion is that a constraint for chest wall pain is yet to be defined.  相似文献   
89.
90.
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