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   2551507篇
  免费   212026篇
  国内免费   4792篇
耳鼻咽喉   36266篇
儿科学   77643篇
妇产科学   66920篇
基础医学   357846篇
口腔科学   71813篇
临床医学   234048篇
内科学   504569篇
皮肤病学   50435篇
神经病学   218599篇
特种医学   102028篇
外国民族医学   902篇
外科学   387575篇
综合类   59390篇
现状与发展   3篇
一般理论   1266篇
预防医学   208673篇
眼科学   59562篇
药学   189811篇
  7篇
中国医学   4666篇
肿瘤学   136303篇
  2018年   27473篇
  2017年   21448篇
  2016年   23403篇
  2015年   26582篇
  2014年   38383篇
  2013年   58333篇
  2012年   79347篇
  2011年   83792篇
  2010年   49110篇
  2009年   46903篇
  2008年   79909篇
  2007年   84999篇
  2006年   85337篇
  2005年   83763篇
  2004年   80638篇
  2003年   77693篇
  2002年   76562篇
  2001年   114529篇
  2000年   118310篇
  1999年   100463篇
  1998年   30249篇
  1997年   27612篇
  1996年   27382篇
  1995年   26361篇
  1994年   24750篇
  1993年   23018篇
  1992年   80824篇
  1991年   77795篇
  1990年   74858篇
  1989年   72109篇
  1988年   67050篇
  1987年   66080篇
  1986年   62526篇
  1985年   59739篇
  1984年   45724篇
  1983年   39117篇
  1982年   24504篇
  1981年   21808篇
  1980年   20438篇
  1979年   42314篇
  1978年   30014篇
  1977年   25346篇
  1976年   23734篇
  1975年   24740篇
  1974年   30461篇
  1973年   28781篇
  1972年   26813篇
  1971年   24640篇
  1970年   23191篇
  1969年   21451篇
排序方式: 共有10000条查询结果,搜索用时 328 毫秒
21.
22.
Troppmair  Teresa  Egger  J.  Krösbacher  A.  Zanvettor  A.  Schinnerl  A.  Neumayr  A.  Baubin  M. 《Der Anaesthesist》2022,71(4):272-280
Die Anaesthesiologie - Die Qualität eines Rettungssystems zeichnet sich auch durch den effizienten Einsatz seiner personellen und Fahrzeugressourcen aus. So können im berechtigten Fall...  相似文献   
23.
24.
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   
25.
26.
27.
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   
28.
29.
Introduction: Pharmacovigilance is essential to monitoring the safety profiles of authorized medicines. Compared with small-molecule drugs, biological drugs are more complex, more susceptible to structural variability due to manufacturing processes, and have the potential to induce immune-related reactions, underscoring the importance of safety monitoring for these products. Although highly similar to reference products, biosimilars are not expected to be structurally identical. For these reasons, proper reporting of potential adverse drug reactions (ADRs) using distinguishable names and batch numbers is essential for accurate tracing of all biological drugs. To address the need for robust pharmacovigilance, the European Parliament and Council of the European Union provided legislation regarding pharmacovigilance of biologics in 2010.

Areas covered: This narrative review examines the current state of pharmacovigilance for biologics in the European Union (EU) and discusses relevant information on pharmacovigilance of biosimilars, the current EU pharmacovigilance system, and areas that could be improved.

Expert opinion: Although steps have been taken to improve pharmacovigilance of biologics in the EU, several enhancements can still be made, including additional training for healthcare professionals on ADR reporting, the use of 2D barcodes that enhance traceability, and an open discussion of potentially missed opportunities in the pharmacovigilance of biosimilars.  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