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   2553607篇
  免费   199574篇
  国内免费   4223篇
耳鼻咽喉   35579篇
儿科学   79467篇
妇产科学   66305篇
基础医学   354963篇
口腔科学   69205篇
临床医学   227833篇
内科学   500414篇
皮肤病学   48760篇
神经病学   217084篇
特种医学   104783篇
外国民族医学   886篇
外科学   391278篇
综合类   58866篇
现状与发展   1篇
一般理论   1000篇
预防医学   207861篇
眼科学   58247篇
药学   187984篇
  4篇
中国医学   4994篇
肿瘤学   141890篇
  2018年   45619篇
  2017年   35810篇
  2016年   40243篇
  2015年   24478篇
  2014年   34673篇
  2013年   51950篇
  2012年   75744篇
  2011年   92972篇
  2010年   60436篇
  2009年   52274篇
  2008年   88604篇
  2007年   95828篇
  2006年   74947篇
  2005年   75105篇
  2004年   73752篇
  2003年   72747篇
  2002年   69945篇
  2001年   112893篇
  2000年   117195篇
  1999年   98615篇
  1998年   28152篇
  1997年   25868篇
  1996年   25614篇
  1995年   24785篇
  1994年   23378篇
  1993年   21705篇
  1992年   79502篇
  1991年   76541篇
  1990年   73750篇
  1989年   70951篇
  1988年   65955篇
  1987年   64915篇
  1986年   61424篇
  1985年   58480篇
  1984年   44284篇
  1983年   37718篇
  1982年   22967篇
  1981年   20341篇
  1979年   41391篇
  1978年   29045篇
  1977年   24361篇
  1976年   22899篇
  1975年   23970篇
  1974年   29677篇
  1973年   28049篇
  1972年   26228篇
  1971年   24151篇
  1970年   22779篇
  1969年   21119篇
  1968年   19156篇
排序方式: 共有10000条查询结果,搜索用时 375 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