全文获取类型
收费全文 | 192714篇 |
免费 | 2046篇 |
国内免费 | 54篇 |
专业分类
耳鼻咽喉 | 1245篇 |
儿科学 | 7146篇 |
妇产科学 | 3493篇 |
基础医学 | 19003篇 |
口腔科学 | 1836篇 |
临床医学 | 14864篇 |
内科学 | 34052篇 |
皮肤病学 | 893篇 |
神经病学 | 18033篇 |
特种医学 | 9210篇 |
外科学 | 30342篇 |
综合类 | 2720篇 |
一般理论 | 19篇 |
预防医学 | 20218篇 |
眼科学 | 3141篇 |
药学 | 10301篇 |
中国医学 | 641篇 |
肿瘤学 | 17657篇 |
出版年
2021年 | 283篇 |
2020年 | 174篇 |
2019年 | 278篇 |
2018年 | 22204篇 |
2017年 | 17567篇 |
2016年 | 19711篇 |
2015年 | 1211篇 |
2014年 | 1243篇 |
2013年 | 1523篇 |
2012年 | 7954篇 |
2011年 | 22099篇 |
2010年 | 19428篇 |
2009年 | 12054篇 |
2008年 | 20497篇 |
2007年 | 22738篇 |
2006年 | 1585篇 |
2005年 | 3207篇 |
2004年 | 4452篇 |
2003年 | 5321篇 |
2002年 | 3467篇 |
2001年 | 494篇 |
2000年 | 621篇 |
1999年 | 406篇 |
1998年 | 458篇 |
1997年 | 384篇 |
1996年 | 245篇 |
1995年 | 258篇 |
1994年 | 233篇 |
1993年 | 184篇 |
1992年 | 196篇 |
1991年 | 222篇 |
1990年 | 252篇 |
1989年 | 216篇 |
1988年 | 180篇 |
1987年 | 150篇 |
1986年 | 127篇 |
1985年 | 142篇 |
1984年 | 127篇 |
1983年 | 146篇 |
1982年 | 132篇 |
1981年 | 107篇 |
1980年 | 148篇 |
1979年 | 101篇 |
1978年 | 101篇 |
1974年 | 114篇 |
1970年 | 114篇 |
1969年 | 137篇 |
1968年 | 136篇 |
1967年 | 132篇 |
1966年 | 135篇 |
排序方式: 共有10000条查询结果,搜索用时 375 毫秒
71.
Background
Reports on childhood cancer survivors estimated cumulative probability of developing secondary neoplasms vary from 3,3% to 25% at 25 years from diagnosis, and the risk of developing another cancer to several times greater than in the general population. 相似文献72.
73.
74.
Gerard J Molloy Derek W Johnston Chuan Gao Miles D Witham Joan M Gray Ishbel S Argo Allan D Struthers Marion E T McMurdo 《European journal of cardiovascular prevention and rehabilitation》2006,13(3):381-387
BACKGROUND: The impact of exercise programmes for heart failure on those close to the patient is largely unknown. We examined the effect of a hospital and home-based exercise intervention on burden, anxiety and depression of informal caregivers. DESIGN: The study was a randomized, controlled trial. Heart failure patients were randomized to a seated 12-week hospital-based exercise programme. Caregiver measures were gathered at baseline, 3 months later and 6 months following baseline. METHODS: Sixty caregivers (mean age 63.4 years, 65% female) of heart failure patients (n = 82, mean age 80.5 years, 44% female) participating in a trial of an exercise intervention were recruited. Caregiver burden, anxiety and depression were assessed. RESULTS: There were no differences in caregiver burden, depression or anxiety between the two groups of caregivers at baseline (caregiver burden, patient control 33.1 versus patient exercise 34.1; anxiety 4.1 versus 5.5; depression 2.8 versus 3.8). At 3 months there were no differences between caregivers in the two groups on outcomes. At 6-month follow-up caregivers of heart failure patients in the exercise group had burden scores that were significantly worse than the control group. There were no differences between the carers of exercise and control groups in anxiety and depression. Levels of anxiety and depression in the entire carer sample were marginally higher than reference values in a healthy non-clinical sample. CONCLUSION: The present exercise interventions for frail older patients did not benefit caregivers and was associated with an increase in caregiver burden. We suggest that future exercise interventions for heart failure patients should actively incorporate informal caregivers into research designs. 相似文献
75.
76.
Birgitta Malmberg Göran Kecklund Björn Karlson Roger Persson Per Flisberg Palle Ørbaek 《BMC health services research》2010,10(1):239
Background
It is well known that physicians' night-call duty may cause impaired performance and adverse effects on subjective health, but there is limited knowledge about effects on sleep duration and recovery time. In recent years occupational stress and impaired well-being among anaesthesiologists have been frequently reported for in the scientific literature. Given their main focus on handling patients with life-threatening conditions, when on call, one might expect sleep and recovery to be negatively affected by work, especially in this specialist group. The aim of the present study was to examine whether a 16-hour night-call schedule allowed for sufficient recovery in anaesthesiologists compared with other physician specialists handling less life-threatening conditions, when on call. 相似文献77.
David Berrigan Linda W Pickle Jennifer Dill 《International journal of health geographics》2010,9(1):20
Background
Past studies of associations between measures of the built environment, particularly street connectivity, and active transportation (AT) or leisure walking/bicycling have largely failed to account for spatial autocorrelation of connectivity variables and have seldom examined both the propensity for AT and its duration in a coherent fashion. Such efforts could improve our understanding of the spatial and behavioral aspects of AT. We analyzed spatially identified data from Los Angeles and San Diego Counties collected as part of the 2001 California Health Interview Survey. 相似文献78.
Sebastiana Z. Kalula G. H. Swingler A. A. Sayer M. Badri M. Ferreira 《The journal of nutrition, health & aging》2010,14(4):319-323
Objective
To test the effects of the use of a collapsible, portable chair (chair B), as opposed to a ‘standard’ chair (chair A), on the outcome of the timed “Up and Go” (TUG) test. 相似文献79.
80.