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   3385162篇
  免费   252194篇
  国内免费   5016篇
耳鼻咽喉   47167篇
儿科学   111103篇
妇产科学   93833篇
基础医学   491726篇
口腔科学   96801篇
临床医学   305969篇
内科学   649224篇
皮肤病学   74120篇
神经病学   270143篇
特种医学   129203篇
外国民族医学   902篇
外科学   508942篇
综合类   76490篇
现状与发展   13篇
一般理论   1299篇
预防医学   267289篇
眼科学   79316篇
药学   253628篇
  13篇
中国医学   6359篇
肿瘤学   178832篇
  2018年   35775篇
  2017年   27247篇
  2016年   30533篇
  2015年   34726篇
  2014年   48786篇
  2013年   73910篇
  2012年   101081篇
  2011年   107352篇
  2010年   63774篇
  2009年   60483篇
  2008年   101344篇
  2007年   107750篇
  2006年   108947篇
  2005年   106008篇
  2004年   102534篇
  2003年   98208篇
  2002年   95840篇
  2001年   151204篇
  2000年   155955篇
  1999年   131878篇
  1998年   38347篇
  1997年   33982篇
  1996年   33966篇
  1995年   32494篇
  1994年   30204篇
  1993年   28512篇
  1992年   105525篇
  1991年   103177篇
  1990年   100779篇
  1989年   97395篇
  1988年   90173篇
  1987年   88528篇
  1986年   83709篇
  1985年   80628篇
  1984年   60450篇
  1983年   51847篇
  1982年   30773篇
  1981年   27747篇
  1979年   56807篇
  1978年   40223篇
  1977年   33746篇
  1976年   32148篇
  1975年   34381篇
  1974年   41601篇
  1973年   39786篇
  1972年   37135篇
  1971年   35072篇
  1970年   32345篇
  1969年   30732篇
  1968年   28097篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
Consecutive patients (n = 215) who were referred to optometric (55%) or multidisciplinary (45%) low-vision services and above 50 years of age were recruited from four hospitals in the Netherlands. They completed two vision-related quality of life questionnaires, the Vision Quality of Life Core Measure (VCM1) and the Low Vision Quality of Life Questionnaire (LVQOL), before their first visit with low-vision services and 1 year later. At follow-up, patients referred to multidisciplinary low-vision services had lower scores on the mobility subscale of the LVQOL than patients referred to optometric low-vision services [5.3 points; 95% confidence interval (CI): 0.2-10.5]. Paired sample t-tests for the two groups of patients taken together show improvement for the VCM1 (3.1 points; 95% CI: 0.6-5.6) and deterioration for the basic aspects of vision (3.5 points; 95% CI: 1.1-5.9) and the mobility (6.6 points; 95% CI: 3.7-9.5) subscales of the LVQOL. In conclusion, people referred to optometric services showed less deterioration in mobility than those referred to multidisciplinary services. No differences were observed for any of the other subscales of the LVQOL and the VCM1. Future research in this field should include randomized controlled designs comparing low-vision services with no treatment or placebo.  相似文献   
132.
133.
OBJECTIVE: To determine whether under-reporting of rheumatic fever occurs at hospital, municipal, provincial and national levels of the South African health system. BACKGROUND: Information on the incidence of rheumatic fever (RF) and the prevalence of rheumatic heart disease (RHD) is required for the prevention of valvular heart disease in developing countries. In South Africa, RF was made a notifiable condition in 1989. It has recently been suggested that the reporting of RF cases may be incomplete, possibly because of underreporting by health care professionals and deficient administration of the disease notification system in South Africa. METHOD AND RESULTS: We assessed whether underreporting of RF cases occurs by comparing the numbers of RF cases reported per year at hospital, municipal, provincial and national levels from 1990 to 2004. There was a fall in the number of RF cases reported per year at national and provincial level over the 15 years of observation. A detailed analysis of the number of RF cases reported at hospital, municipal and provincial level for a 5-year period showed that more cases were diagnosed in one hospital (serving a smaller population) than were captured at municipal and provincial level (serving a larger population), suggesting underreporting by health care professionals. There were discrepancies in the number of cases reported at municipal, provincial and national level, suggesting poor administration of the notification system. CONCLUSION: There appears to be underreporting of RF cases by health care professionals, and poor administration of the RF notification system. Health care professionals need to be educated about the statutory requirement to notify all RF cases in South Africa. An effective national disease notification system is required.  相似文献   
134.
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   
135.
136.
137.
138.
Traumatic injuries of the elbow are frequent in patients of all ages but are particularly common in young children and adolescents engaged in normal play and athletic competition. Injury may result primarily due to direct trauma or may be secondary to transmission of forces through the elbow following a fall on an outstretched hand. In middle-aged and older individuals, chronic repetitive injuries tend to predominate. In all patients, radiographs remain the initial imaging study of choice. Many patients, however, may need advanced cross-sectional imaging (i.e. MRI, CT, or ultrasound) either at presentation or during the course of their treatment and follow-up. This article reviews the imaging appearance of common acute and chronic traumatic disorders of the elbow.  相似文献   
139.
140.
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