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   2369747篇
  免费   198207篇
  国内免费   4202篇
耳鼻咽喉   34259篇
儿科学   72731篇
妇产科学   62923篇
基础医学   334736篇
口腔科学   67513篇
临床医学   215318篇
内科学   467951篇
皮肤病学   47926篇
神经病学   200689篇
特种医学   95937篇
外国民族医学   886篇
外科学   360305篇
综合类   56195篇
现状与发展   1篇
一般理论   977篇
预防医学   190340篇
眼科学   55423篇
药学   177467篇
  4篇
中国医学   4365篇
肿瘤学   126210篇
  2018年   24211篇
  2016年   20573篇
  2015年   23284篇
  2014年   33535篇
  2013年   50840篇
  2012年   68745篇
  2011年   72276篇
  2010年   42474篇
  2009年   40863篇
  2008年   68762篇
  2007年   73101篇
  2006年   73997篇
  2005年   72041篇
  2004年   69338篇
  2003年   67013篇
  2002年   66264篇
  2001年   112451篇
  2000年   116524篇
  1999年   98338篇
  1998年   27859篇
  1997年   25524篇
  1996年   25451篇
  1995年   24609篇
  1994年   23165篇
  1993年   21554篇
  1992年   79390篇
  1991年   76397篇
  1990年   73579篇
  1989年   70842篇
  1988年   65852篇
  1987年   64802篇
  1986年   61338篇
  1985年   58401篇
  1984年   44225篇
  1983年   37658篇
  1982年   22891篇
  1981年   20333篇
  1980年   19035篇
  1979年   41304篇
  1978年   28991篇
  1977年   24348篇
  1976年   22832篇
  1975年   23966篇
  1974年   29639篇
  1973年   28044篇
  1972年   26226篇
  1971年   24151篇
  1970年   22754篇
  1969年   21091篇
  1968年   19138篇
排序方式: 共有10000条查询结果,搜索用时 280 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.
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   
25.
26.
27.
28.
29.
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   
30.
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