全文获取类型
收费全文 | 2548976篇 |
免费 | 186225篇 |
国内免费 | 4025篇 |
专业分类
耳鼻咽喉 | 35977篇 |
儿科学 | 83588篇 |
妇产科学 | 71182篇 |
基础医学 | 361568篇 |
口腔科学 | 74996篇 |
临床医学 | 224677篇 |
内科学 | 487661篇 |
皮肤病学 | 56451篇 |
神经病学 | 202798篇 |
特种医学 | 102959篇 |
外国民族医学 | 685篇 |
外科学 | 388436篇 |
综合类 | 57541篇 |
现状与发展 | 4篇 |
一般理论 | 802篇 |
预防医学 | 187834篇 |
眼科学 | 59408篇 |
药学 | 196178篇 |
10篇 | |
中国医学 | 5418篇 |
肿瘤学 | 141053篇 |
出版年
2018年 | 25573篇 |
2017年 | 20226篇 |
2016年 | 23081篇 |
2015年 | 26298篇 |
2014年 | 35215篇 |
2013年 | 52803篇 |
2012年 | 72443篇 |
2011年 | 75925篇 |
2010年 | 44836篇 |
2009年 | 41988篇 |
2008年 | 72174篇 |
2007年 | 76685篇 |
2006年 | 77983篇 |
2005年 | 75667篇 |
2004年 | 73770篇 |
2003年 | 70708篇 |
2002年 | 68877篇 |
2001年 | 122897篇 |
2000年 | 126585篇 |
1999年 | 106807篇 |
1998年 | 28479篇 |
1997年 | 25424篇 |
1996年 | 25165篇 |
1995年 | 24171篇 |
1994年 | 22409篇 |
1993年 | 21154篇 |
1992年 | 84365篇 |
1991年 | 81651篇 |
1990年 | 80141篇 |
1989年 | 77414篇 |
1988年 | 71289篇 |
1987年 | 70128篇 |
1986年 | 66476篇 |
1985年 | 63722篇 |
1984年 | 47121篇 |
1983年 | 40366篇 |
1982年 | 23238篇 |
1981年 | 20591篇 |
1979年 | 44264篇 |
1978年 | 30499篇 |
1977年 | 26237篇 |
1976年 | 24054篇 |
1975年 | 26160篇 |
1974年 | 31410篇 |
1973年 | 30228篇 |
1972年 | 28315篇 |
1971年 | 26650篇 |
1970年 | 24458篇 |
1969年 | 23187篇 |
1968年 | 21106篇 |
排序方式: 共有10000条查询结果,搜索用时 12 毫秒
101.
Michiel R. de Boer Jos Twisk Annette C. Moll Hennie J. M. Völker-Dieben Henrica C. W. de Vet Ger H. M. B. van Rens 《Ophthalmic & physiological optics》2006,26(6):535-544
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
102.
103.
104.
Four clinical trials of porcine islet transplantation have been reported, and there are verbal reports that clinical trials on much larger scales are continuing in centers in China and Russia. The four reported trials are briefly reviewed and, in the light of the present status of experimental islet xenotransplantation, consideration is given to whether such trials are currently justified. The Ethics Committee of the International Xenotransplantation Association has (1) emphasized the need for encouraging studies in non-human primates before clinical trials should be undertaken, (2) mandatory monitoring for the transfer of porcine microorganisms, and (3) careful regulation and oversight by recognized bodies. Other aspects of the topic, such as the need for informed consent, are briefly discussed. We conclude that, at the present time, more data documenting convincing efficacy, focused on clinically applicable immunosuppressive regimens, are needed to justify the initiation of closely monitored clinical trials. A clinical trial may then be justified even though the potential risk to the patients, and possibly for society, will not be zero. 相似文献
105.
B Nkgudi K A Robertson J Volmink B M Mayosi 《Suid-Afrikaanse tydskrif vir geneeskunde》2006,96(3):206-208
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
106.
107.
Claire M Rickard Brigit L Roberts Jonathon Foote Matthew R McGrail 《Dimensions of critical care nursing》2006,25(5):234-242
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
108.
109.
110.