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   832篇
  免费   72篇
  国内免费   62篇
耳鼻咽喉   4篇
儿科学   46篇
妇产科学   8篇
基础医学   122篇
口腔科学   22篇
临床医学   130篇
内科学   233篇
皮肤病学   22篇
神经病学   20篇
特种医学   99篇
外科学   61篇
综合类   20篇
预防医学   74篇
眼科学   5篇
药学   53篇
中国医学   2篇
肿瘤学   45篇
  2023年   7篇
  2022年   9篇
  2021年   13篇
  2020年   8篇
  2019年   15篇
  2018年   25篇
  2017年   10篇
  2016年   18篇
  2015年   13篇
  2014年   28篇
  2013年   43篇
  2012年   23篇
  2011年   28篇
  2010年   41篇
  2009年   38篇
  2008年   31篇
  2007年   60篇
  2006年   24篇
  2005年   26篇
  2004年   22篇
  2003年   17篇
  2002年   17篇
  2001年   19篇
  2000年   13篇
  1999年   25篇
  1998年   35篇
  1997年   39篇
  1996年   24篇
  1995年   25篇
  1994年   32篇
  1993年   24篇
  1992年   10篇
  1991年   14篇
  1990年   8篇
  1989年   24篇
  1988年   23篇
  1987年   16篇
  1986年   7篇
  1985年   12篇
  1984年   10篇
  1983年   7篇
  1982年   12篇
  1981年   13篇
  1980年   8篇
  1978年   10篇
  1977年   7篇
  1976年   11篇
  1975年   6篇
  1972年   3篇
  1923年   2篇
排序方式: 共有966条查询结果,搜索用时 15 毫秒
61.
62.
OBJECTIVES: To investigate the prevalence of back pain in the German working population and the relationship between back pain and workplace stresses, lifestyle and social factors. METHODS: The first National Health Survey of the Federal Republic of Germany was carried out between October 1997 and March 1999. It comprised a representative epidemiological cross-sectional study of the working population, with a total sample of 3,488 persons between the ages of 18 and 69 years. The participants took part in a medical examination and answered a self-rating questionnaire. The relationship between subjective back pain and workplace stresses and social and lifestyle factors was investigated with bivariate tests and multiple logistical regression analyses. RESULTS: The 7-day prevalence for back pain in the German working population was found to be 34%, and the 1-year prevalence was 60%. The odds ratios were significantly higher in women, persons of lower socioeconomic status, married and depressed persons and non-athletes. Carrying heavy loads or maintaining a single working posture were the most significant work-related correlates of back pain, for members of both the female and male working population, while environmental stress and psychological stress correlated significantly with back pain in men only. CONCLUSIONS: This study reports the first representative epidemiological prevalence data for back pain, and its correlates and potential risk factors, for the German working population. To reduce the negative impact of back pain the most promising behavioural and conditional prevention measures in the workplace would be to reduce carrying stress and to vary working posture. In addition, a more active, athletic lifestyle, plus the avoidance of being overweight, should provide an additional protective or preventive effect.  相似文献   
63.

Background  

The purpose of this study was to evaluate the long-term results of partial liver resection for benign liver lesions.  相似文献   
64.
65.
OBJECTIVE: High-dose vitamin C therapy might mediate beneficial clinical effects by counteracting reactive oxygen species. However, concerns are raised whether this approach might provoke diametrical (ie pro-oxidative) effects. The objective was to determine ascorbyl free radical (AFR) concentrations and potential variables of pro-oxidative damage. DESIGN: Crossover study; six healthy males received daily infusions of 750 or 7500 mg vitamin C for six consecutive days. Fasting concentrations of vitamin C and AFR were determined daily. On day 1, concentrations of vitamin C and AFR were measured at 0.25, 0.5, 1, 2, 4 and 8 h post infusion. Plasma concentrations of thiobarbituric acid-reactive substances (TBARS), tocopherol and urine concentrations of 8-oxoguanosine were determined on days 1 and 6. RESULTS: Kinetic studies on day 1 showed that concentrations of vitamin C and AFR displayed parallel dose- and time-dependent kinetics and elimination was highly efficient. Vitamin C and AFR fasting concentrations on days 2-6 were slightly above the baseline, suggesting new, stable steady states. TBARS decreased in both groups, whereas tocopherol and 8-oxoguanosine concentrations remained unchanged. CONCLUSION: Kinetics of AFR largely depend on plasma vitamin C concentrations and AFR is eliminated efficiently. Our data do not support induction of pro-oxidative effects in healthy volunteers given intravenous high-dose vitamin C. SPONSORSHIP: Pascoe Pharmazeutische Pr?parate GmbH, Giessen, Germany.  相似文献   
66.
Background The National Health Strategy envisages a health system incorporating patient views; and providing accessible, consultant-led dialysis services with patient choice of dialysis modality, in all regions. Aims To describe patients’ experiences of renal services against National Health Strategy objectives. Methods Telephone interviews with 192 dialysis patients from three hospitals in the Eastern region. Results One-quarter of participants (16% of haemodialysis [HD] and 46% of peritoneal dialysis patients) lived outside the Eastern region, and travelled there because dialysis was not available locally. Two-thirds (65%) had a choice of dialysis modality. High satisfaction with interpersonal care was observed (83–98% satisfaction). Dissatisfaction with physical environment included parking (39–56%), waiting areas (62–69%), HD unit space (74%). Regarding support services, dietary services were satisfactory (92–95%), with lower satisfaction ratings for social and financial support services (62%). Conclusions Structural and management issues must be addressed to advance a quality agenda for renal care in Ireland.  相似文献   
67.

Background  

This article discusses the design of a study on the prevalence of health problems (both physical and mental) and the utilisation of health care services among asylum seekers and refugees in the Netherlands, including factors that may be related to their health and their utilisation of these services.  相似文献   
68.
69.
The European Prospective Investigation into Cancer and Nutrition (EPIC) is a prospective multicentre study that has been implemented to further the understanding of the association between diet and chronic diseases with emphasis on cancer. In Heidelberg from June 1994 until October 1998 about 25,500 subjects aged 35 to 65 years in women and 40 to 65 years in men were recruited. Apart from extensive questions about food intake, the participants were also asked to provide detailed information about their smoking habits, physical activity, subjective well-being, medical history and use of medications. As well as completing the questionnaire and a personal interview, the participants also gave blood samples and anthropometiric measures and the blood pressure were taken in standardized manner. The analyses of the EPIC study will depend on achieving a comprehensive record of all new cancer cases, and all deaths, together with the corresponding cause of death, within the study population. To date all self-reported incident cancer cases are verified by comparing them with pathology reports and hospital records. They are then coded according to the coding list for the International Classification of Diseases (ICD-O2) issued by the World Health Organisation (WHO). Since at begin of the investigation in the study region no cancer registration existed, the participants are followed -up by interval questioning ('active follow-up'). In order to integrate increasingly the data of the Cancer registry Baden-Württemberg (EKR-BW) attempts were made to explore record linkage systems. For this purpose, in the years 2000, 2002, 2003 record linkages between EPIC-Heidelberg and EKR-BW were performed. Procedures were evaluated for performing an anonymous linkage of the EPIC data with the data of the EKR-BW. After a pilot project on the feasibility of the linkage the program was evaluated on the EPIC data, record linkages are performed regularly. Different coding systems were applied. Simultaneously, the EPIC data about on cancer cases among the Heidelberg study participants are passed on to the Cancer Registry, thus contributing to improve completeness of the registry. So far the active follow-up can not be replaced by passive follow-up through record linkage with the cancer registry, but in the long-term it may be possible. Since the technical requirements are complied with, attempts should be made to improve the completeness of the epidemiological cancer registry Baden- Württemberg.  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