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   2412840篇
  免费   200655篇
  国内免费   4393篇
耳鼻咽喉   34893篇
儿科学   73780篇
妇产科学   63636篇
基础医学   339893篇
口腔科学   68461篇
临床医学   219775篇
内科学   476824篇
皮肤病学   48762篇
神经病学   205041篇
特种医学   97215篇
外国民族医学   886篇
外科学   367381篇
综合类   56657篇
现状与发展   1篇
一般理论   1019篇
预防医学   193776篇
眼科学   56374篇
药学   179952篇
  6篇
中国医学   4400篇
肿瘤学   129156篇
  2018年   25172篇
  2017年   19497篇
  2016年   21390篇
  2015年   24202篇
  2014年   34814篇
  2013年   52721篇
  2012年   71690篇
  2011年   75509篇
  2010年   44238篇
  2009年   42493篇
  2008年   71707篇
  2007年   76138篇
  2006年   76902篇
  2005年   74968篇
  2004年   72160篇
  2003年   69761篇
  2002年   68803篇
  2001年   112765篇
  2000年   116798篇
  1999年   98725篇
  1998年   28367篇
  1997年   25956篇
  1996年   25815篇
  1995年   24968篇
  1994年   23471篇
  1993年   21813篇
  1992年   79604篇
  1991年   76566篇
  1990年   73740篇
  1989年   70958篇
  1988年   66010篇
  1987年   64927篇
  1986年   61460篇
  1985年   58538篇
  1984年   44394篇
  1983年   37831篇
  1982年   23147篇
  1981年   20551篇
  1980年   19220篇
  1979年   41365篇
  1978年   29078篇
  1977年   24439篇
  1976年   22882篇
  1975年   24001篇
  1974年   29679篇
  1973年   28079篇
  1972年   26241篇
  1971年   24163篇
  1970年   22760篇
  1969年   21097篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
Adjuvant irradiation is the standard treatment after breast conservative surgery. Normofractionated regimen with an overall treatment time of 5 to 6 weeks is often considered as a limiting factor for irradiation compliance. In order to answer this issue, moderate and more recently extreme hypofractionated protocols appeared. We report here oncological outcomes and toxicity of hypofractionated breast irradiation. After defining the frame of moderate and extreme hypofractionated breast irradiations based on overall treatment time, patient selection criteria were listed. According to their levels of proof, the results of moderate and extreme hypofractionated breast irradiation were analysed. Overall treatment time for moderate hypofractionated breast irradiation ranged from 3 to 4 weeks, while for extreme hypofractionated breast irradiation, it was less than 1 week. For moderate hypofractionated breast irradiation, whole breast irradiation was currently performed with or without lymph node irradiation. Moderate hypofractionated breast irradiation has proven to be as safe and as efficient as normofractionated breast irradiation with level IA evidence. For extreme hypofractionated breast irradiation, phase III randomized trials confirmed that accelerated partial breast irradiation was non-inferior in terms of local control compared to normofractionated whole breast irradiation (with external beam radiation therapy and multicatheter brachytherapy), with similar acute and late toxicity. While the use of intraoperative breast irradiation remains under debate, new very accelerated partial breast irradiation (overall treatment time not exceeding 2 days) protocols emerged with encouraging results. Accelerated partial breast irradiation is warranted for extreme hypofractionated breast irradiation and is indicated for low-risk breast cancers. Moderate and extreme hypofractionated breast irradiation regimens are validated and can be routinely proposed according to patient selection criteria.  相似文献   
23.
24.
25.
Secondary tricuspid regurgitation (TR) caused by right ventricular enlargement in the setting of left heart disease/pulmonary hypertension has been well described. In contrast, that associated with right atrial enlargement—atrial functional TR (AF‐TR)—remains largely underappreciated. AF‐TR most often occurs in the setting of lone atrial fibrillation, although it is also seen in its absence (idiopathic AF‐TR). Several recent studies have found that the prevalence, hemodynamic significance, and prognosis of AF‐TR are not inconsequential, suggesting increased physician awareness of this novel clinical entity is warranted. This article discusses the pathogenesis, echocardiographic findings, and treatment of this underappreciated cause of secondary TR.  相似文献   
26.
27.
28.
29.
30.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  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