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   2414576篇
  免费   201671篇
  国内免费   6983篇
耳鼻咽喉   34769篇
儿科学   73361篇
妇产科学   63370篇
基础医学   338731篇
口腔科学   68088篇
临床医学   221158篇
内科学   473169篇
皮肤病学   48430篇
神经病学   202525篇
特种医学   97541篇
外国民族医学   902篇
外科学   364010篇
综合类   66391篇
现状与发展   9篇
一般理论   978篇
预防医学   194319篇
眼科学   56654篇
药学   182799篇
  58篇
中国医学   6964篇
肿瘤学   129004篇
  2018年   25235篇
  2017年   20053篇
  2016年   21616篇
  2015年   25113篇
  2014年   36012篇
  2013年   53460篇
  2012年   72561篇
  2011年   76556篇
  2010年   45807篇
  2009年   43682篇
  2008年   72062篇
  2007年   76088篇
  2006年   76928篇
  2005年   74414篇
  2004年   71185篇
  2003年   68704篇
  2002年   67671篇
  2001年   113512篇
  2000年   117343篇
  1999年   98931篇
  1998年   28246篇
  1997年   25895篇
  1996年   25738篇
  1995年   24846篇
  1994年   23398篇
  1993年   21668篇
  1992年   79495篇
  1991年   76489篇
  1990年   73625篇
  1989年   70888篇
  1988年   65899篇
  1987年   64831篇
  1986年   61350篇
  1985年   58418篇
  1984年   44234篇
  1983年   37660篇
  1982年   22888篇
  1981年   20334篇
  1979年   41300篇
  1978年   28987篇
  1977年   24346篇
  1976年   22832篇
  1975年   23965篇
  1974年   29643篇
  1973年   28043篇
  1972年   26228篇
  1971年   24152篇
  1970年   22752篇
  1969年   21087篇
  1968年   19136篇
排序方式: 共有10000条查询结果,搜索用时 31 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