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   2392181篇
  免费   200274篇
  国内免费   4240篇
耳鼻咽喉   34498篇
儿科学   73317篇
妇产科学   63375篇
基础医学   337822篇
口腔科学   68447篇
临床医学   218101篇
内科学   472273篇
皮肤病学   48152篇
神经病学   202447篇
特种医学   96626篇
外国民族医学   887篇
外科学   363088篇
综合类   56758篇
现状与发展   1篇
一般理论   1005篇
预防医学   193031篇
眼科学   56109篇
药学   179086篇
  5篇
中国医学   4384篇
肿瘤学   127283篇
  2018年   24623篇
  2016年   20891篇
  2015年   23649篇
  2014年   34064篇
  2013年   51667篇
  2012年   69922篇
  2011年   73495篇
  2010年   43139篇
  2009年   41498篇
  2008年   69847篇
  2007年   74236篇
  2006年   75027篇
  2005年   73131篇
  2004年   70301篇
  2003年   67946篇
  2002年   67131篇
  2001年   112918篇
  2000年   117024篇
  1999年   98811篇
  1998年   28089篇
  1997年   25701篇
  1996年   25636篇
  1995年   24799篇
  1994年   23340篇
  1993年   21738篇
  1992年   79747篇
  1991年   76768篇
  1990年   73983篇
  1989年   71163篇
  1988年   66188篇
  1987年   65139篇
  1986年   61638篇
  1985年   58737篇
  1984年   44484篇
  1983年   37901篇
  1982年   23049篇
  1981年   20519篇
  1980年   19193篇
  1979年   41560篇
  1978年   29173篇
  1977年   24518篇
  1976年   22999篇
  1975年   24123篇
  1974年   29831篇
  1973年   28237篇
  1972年   26387篇
  1971年   24300篇
  1970年   22888篇
  1969年   21214篇
  1968年   19258篇
排序方式: 共有10000条查询结果,搜索用时 828 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