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   2384991篇
  免费   199477篇
  国内免费   5174篇
耳鼻咽喉   34372篇
儿科学   72896篇
妇产科学   63056篇
基础医学   336352篇
口腔科学   67783篇
临床医学   217331篇
内科学   470574篇
皮肤病学   48057篇
神经病学   201402篇
特种医学   96412篇
外国民族医学   897篇
外科学   361582篇
综合类   58766篇
现状与发展   4篇
一般理论   978篇
预防医学   191625篇
眼科学   55897篇
药学   178944篇
  20篇
中国医学   5188篇
肿瘤学   127506篇
  2018年   24660篇
  2017年   19222篇
  2016年   20953篇
  2015年   23857篇
  2014年   34248篇
  2013年   51469篇
  2012年   69774篇
  2011年   73423篇
  2010年   43283篇
  2009年   41540篇
  2008年   69445篇
  2007年   73867篇
  2006年   74700篇
  2005年   72713篇
  2004年   69783篇
  2003年   67406篇
  2002年   66615篇
  2001年   112729篇
  2000年   116794篇
  1999年   98606篇
  1998年   28100篇
  1997年   25716篇
  1996年   25598篇
  1995年   24729篇
  1994年   23263篇
  1993年   21617篇
  1992年   79457篇
  1991年   76462篇
  1990年   73636篇
  1989年   70896篇
  1988年   65887篇
  1987年   64841篇
  1986年   61365篇
  1985年   58420篇
  1984年   44236篇
  1983年   37666篇
  1982年   22895篇
  1981年   20340篇
  1979年   41305篇
  1978年   28986篇
  1977年   24346篇
  1976年   22835篇
  1975年   23968篇
  1974年   29643篇
  1973年   28045篇
  1972年   26230篇
  1971年   24153篇
  1970年   22757篇
  1969年   21095篇
  1968年   19140篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
21.
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   
22.
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