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   1659140篇
  免费   119319篇
  国内免费   6344篇
耳鼻咽喉   21541篇
儿科学   50437篇
妇产科学   44777篇
基础医学   242081篇
口腔科学   46426篇
临床医学   155105篇
内科学   324604篇
皮肤病学   33638篇
神经病学   134709篇
特种医学   60197篇
外国民族医学   439篇
外科学   237060篇
综合类   36600篇
现状与发展   2篇
一般理论   510篇
预防医学   128810篇
眼科学   37180篇
药学   125542篇
  7篇
中国医学   4967篇
肿瘤学   100171篇
  2021年   13026篇
  2019年   13707篇
  2018年   19717篇
  2017年   14856篇
  2016年   15952篇
  2015年   18248篇
  2014年   25217篇
  2013年   37895篇
  2012年   52027篇
  2011年   54778篇
  2010年   31940篇
  2009年   29571篇
  2008年   50206篇
  2007年   53283篇
  2006年   53317篇
  2005年   51080篇
  2004年   48725篇
  2003年   46493篇
  2002年   45042篇
  2001年   84324篇
  2000年   86820篇
  1999年   72371篇
  1998年   18971篇
  1997年   16869篇
  1996年   16328篇
  1995年   15419篇
  1994年   14248篇
  1993年   13323篇
  1992年   55601篇
  1991年   53743篇
  1990年   51919篇
  1989年   49810篇
  1988年   45854篇
  1987年   44341篇
  1986年   42078篇
  1985年   39925篇
  1984年   29219篇
  1983年   24619篇
  1982年   14158篇
  1979年   25818篇
  1978年   17886篇
  1977年   14832篇
  1976年   13902篇
  1975年   14537篇
  1974年   17645篇
  1973年   17144篇
  1972年   16021篇
  1971年   15015篇
  1970年   13823篇
  1969年   12824篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
There are no data available combining transbronchial needle aspiration (TBNA) of mediastinal lymph nodes and positron emission tomography (PET) in the staging of nonsmall cell lung cancer (NSCLC). The aim of the current study was to determine if these two methods can enhance the negative predictive value of the individual modality alone, for a specific lymph node station, and if this integrated approach can reduce the number of mediastinoscopies. A total of 113 patients with enlarged mediastinal lymph nodes (> or = 1 cm), who underwent both TBNA and PET scanning, were included. In 51 patients, histopathology, confirmed by surgical lymph node dissection, was compared with PET results and TBNA. Sensitivity, specificity, positive predictive value, negative predictive value and accuracy to detect malignant lymphadenopathy was 68 (13/19), 89 (119/134), 46 (13/28), 95 (119/125) and 86% (132/152) for PET, respectively; 54% (6/11), 100 (53/53), 100 (6/6), 91 (53/58) and 92% (59/64), respectively for TBNA; and 100 (11/11), 94 (50/53), 79 (11/14), 100 (50/50) and 95 (61/64) for combined TBNA and PET, respectively. Combination of transbronchial needle aspiration and positron emission tomography has the potential to allow adequate mediastinal staging of nonsmall cell lung cancer with enlarged lymph nodes in most patients without the need for mediastinoscopy.  相似文献   
62.
63.
64.
65.
66.
67.
French asthma patients may be supervised by general practitioners (GPs) and/or specialists. Therefore, this study examined asthma management in patients exclusively supervised by specialists (SPE), GPs, (GP) and both (GP+SPE group), and compared the findings. Asthma patients were consecutively recruited in 348 pharmacies. Each patient completed a questionnaire providing data on personal characteristics, asthma management, perception of disease and asthma supervision. Asthma control was measured using the Asthma Control Test. Questionnaires were linked to computerised records of medications which had been dispensed before inclusion in the study. From the 1,256 patients (mean age = 36.1 yrs, 54.3% females), 11.4, 36.6, and 52.0% were placed in the SPE, GP, and GP+SPE groups, respectively. During the previous 4 weeks, most patients in the SPE group were properly controlled (52.2 versus 26.4 and 21.5% in GP and GP+SPE groups, respectively). The SPE group made more use of fixed combinations of long-acting beta agonist and inhaled corticosteroid, while receiving less short-acting beta agonists, antitussives and antibiotics. Striking differences in symptoms and asthma management were observed according to the type of asthma supervision. The current results strongly support the need to improve the management of asthma in primary care, and the coordination of care between general practitioners and specialists.  相似文献   
68.
69.
Research coordinators in intensive care are a growing specialty about which little is known. This cross-sectional study surveyed the Australia and New Zealand Intensive Care Research Coordinators' Group (n = 49) regarding demographics, education, employment history, job structure, and role content. Most research coordinators were highly qualified and experienced nurses who undertake pharmaceutical trials, multicenter projects, departmental medical and nursing research, audits and data registries, and their own projects.  相似文献   
70.
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