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   2373682篇
  免费   198452篇
  国内免费   4229篇
耳鼻咽喉   34293篇
儿科学   72819篇
妇产科学   63018篇
基础医学   335294篇
口腔科学   67564篇
临床医学   215718篇
内科学   469035篇
皮肤病学   47963篇
神经病学   201019篇
特种医学   96042篇
外国民族医学   887篇
外科学   360942篇
综合类   56209篇
现状与发展   1篇
一般理论   979篇
预防医学   190580篇
眼科学   55512篇
药学   177644篇
  4篇
中国医学   4368篇
肿瘤学   126472篇
  2018年   24367篇
  2016年   20666篇
  2015年   23419篇
  2014年   33667篇
  2013年   51034篇
  2012年   69020篇
  2011年   72536篇
  2010年   42629篇
  2009年   40996篇
  2008年   68985篇
  2007年   73323篇
  2006年   74238篇
  2005年   72209篇
  2004年   69495篇
  2003年   67167篇
  2002年   66390篇
  2001年   112477篇
  2000年   116553篇
  1999年   98355篇
  1998年   27875篇
  1997年   25545篇
  1996年   25453篇
  1995年   24618篇
  1994年   23170篇
  1993年   21563篇
  1992年   79404篇
  1991年   76407篇
  1990年   73586篇
  1989年   70850篇
  1988年   65855篇
  1987年   64814篇
  1986年   61348篇
  1985年   58411篇
  1984年   44233篇
  1983年   37665篇
  1982年   22891篇
  1981年   20337篇
  1980年   19037篇
  1979年   41303篇
  1978年   28991篇
  1977年   24350篇
  1976年   22835篇
  1975年   23967篇
  1974年   29648篇
  1973年   28053篇
  1972年   26238篇
  1971年   24161篇
  1970年   22756篇
  1969年   21093篇
  1968年   19140篇
排序方式: 共有10000条查询结果,搜索用时 812 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