全文获取类型
| 收费全文 | 2592453篇 |
| 免费 | 185479篇 |
| 国内免费 | 7588篇 |
专业分类
| 耳鼻咽喉 | 34307篇 |
| 儿科学 | 85374篇 |
| 妇产科学 | 71684篇 |
| 基础医学 | 364240篇 |
| 口腔科学 | 69791篇 |
| 临床医学 | 234978篇 |
| 内科学 | 516578篇 |
| 皮肤病学 | 62612篇 |
| 神经病学 | 213970篇 |
| 特种医学 | 100013篇 |
| 外国民族医学 | 736篇 |
| 外科学 | 387206篇 |
| 综合类 | 50432篇 |
| 现状与发展 | 5篇 |
| 一般理论 | 970篇 |
| 预防医学 | 196562篇 |
| 眼科学 | 56772篇 |
| 药学 | 188375篇 |
| 8篇 | |
| 中国医学 | 5348篇 |
| 肿瘤学 | 145559篇 |
出版年
| 2021年 | 20138篇 |
| 2019年 | 20777篇 |
| 2018年 | 29470篇 |
| 2017年 | 22712篇 |
| 2016年 | 26363篇 |
| 2015年 | 29637篇 |
| 2014年 | 40647篇 |
| 2013年 | 60647篇 |
| 2012年 | 80550篇 |
| 2011年 | 84838篇 |
| 2010年 | 51209篇 |
| 2009年 | 49324篇 |
| 2008年 | 79308篇 |
| 2007年 | 84094篇 |
| 2006年 | 85844篇 |
| 2005年 | 81974篇 |
| 2004年 | 78912篇 |
| 2003年 | 76258篇 |
| 2002年 | 73511篇 |
| 2001年 | 128501篇 |
| 2000年 | 131431篇 |
| 1999年 | 110595篇 |
| 1998年 | 31298篇 |
| 1997年 | 27960篇 |
| 1996年 | 28259篇 |
| 1995年 | 27419篇 |
| 1994年 | 25100篇 |
| 1993年 | 23444篇 |
| 1992年 | 85232篇 |
| 1991年 | 81627篇 |
| 1990年 | 78847篇 |
| 1989年 | 76138篇 |
| 1988年 | 69531篇 |
| 1987年 | 68055篇 |
| 1986年 | 63590篇 |
| 1985年 | 60562篇 |
| 1984年 | 44966篇 |
| 1983年 | 37974篇 |
| 1982年 | 22469篇 |
| 1981年 | 20000篇 |
| 1979年 | 38981篇 |
| 1978年 | 27466篇 |
| 1977年 | 23264篇 |
| 1976年 | 21512篇 |
| 1975年 | 22819篇 |
| 1974年 | 26797篇 |
| 1973年 | 25380篇 |
| 1972年 | 23759篇 |
| 1971年 | 21968篇 |
| 1970年 | 20198篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
21.
22.
23.
24.
25.
26.
Daniel J. Snyder Thomas R. Kroshus Aakash Keswani Evan B. Garden Karl M. Koenig Kevin J. Bozic David S. Jevsevar Jashvant Poeran Calin S. Moucha 《The Journal of arthroplasty》2019,34(4):613-618
Background
Nursing Home Compare (NHC) ratings, created and maintained by Medicare, are used by both hospitals and consumers to aid in the skilled nursing facility (SNF) selection process. To date, no studies have linked NHC ratings to actual episode-based outcomes. The purpose of this study was to evaluate whether NHC ratings are valid predictors of 90-day complications, readmission, and bundle costs for patients discharged to an SNF after primary total joint arthroplasty (TJA).Methods
All SNF-discharged primary TJA cases in 2017 at a multihospital academic health system were queried. Demographic, psychosocial, and clinical variables were manually extracted from the health record. Medicare NHC ratings were then collected for each SNF. For patients in the Medicare bundle, postacute and total bundle cost was extracted from claims.Results
Four hundred eighty-eight patients were discharged to a total of 105 unique SNFs. In multivariate analysis, overall NHC rating was not predictive of 90-day readmission/major complications, >75th percentile postacute cost, or 90-day bundle cost exceeding the target price. SNF health inspection and quality measure ratings were also not predictive of 90-day readmission/major complications or bundle performance. A higher SNF staffing rating was independently associated with a decreased odds for >75th percentile 90-day postacute spend (odds ratio, 0.58; P = .01) and a 90-day bundle cost exceeding the target price (odds ratio = 0.69; P = .02) but was similarly not predictive of 90-day readmission/complications.Conclusion
Results of our study suggest that Medicare's NHC tool is not a useful predictor of 90-day costs, complications, or readmissions for SNFs within our health system. 相似文献27.
Joseph M. Northey Kate L. Pumpa Clare Quinlan Ashley Ikin Kellie Toohey Disa J. Smee Ben Rattray 《Journal of Science and Medicine in Sport》2019,22(5):580-585
Objectives
The current study investigated the effects of two exercise interventions on cognitive function amongst breast cancer survivors.Design
Pilot randomised-controlled trial.Methods
Seventeen female cancer survivors (mean: 62.9 ± 7.8 years) were randomised into three groups: high-intensity interval training (HIIT, n = 6); moderate-intensity continuous training (MOD, n = 5); or wait-list control (CON, n = 6). The HIIT and MOD groups exercised on a cycle ergometer 3 days/week for 12-weeks. Primary outcomes were cognitive function assessments utilising CogState. Secondary outcomes were resting middle cerebral artery blood flow velocity, cerebrovascular reactivity and aerobic fitness (VO2peak). Data were analysed with General Linear Mixed Models and Cohen’s d effect sizes were calculated.Results
All 17 participants who were randomised were available for follow-up analysis and adherence was similar for HIIT and MOD (78.7 ± 13.2% vs 79.4 ± 12.0%; p = 0.93). Although there were no significant differences in the cognitive and cerebrovascular outcomes, HIIT produced moderate to large positive effects in comparison to MOD and CON for outcomes including episodic memory, working memory, executive function, cerebral blood flow and cerebrovascular reactivity. HIIT significantly increased VO2peak by 19.3% (d = 1.28) and MOD had a non-significant 5.6% (d = 0.72) increase, compared to CON which had a 2.6% decrease.Conclusions
This study provides preliminary evidence that HIIT may be an effective exercise intervention to improve cognitive performance, cerebrovascular function and aerobic fitness in breast cancer survivors. Considering the sample size is small, these results should be confirmed through larger clinical trials. 相似文献28.
Gunilla M. Bergqvist Salmir Nasic Carina U. Persson 《Topics in stroke rehabilitation》2019,26(5):366-372
Background: Before implementation of the new scale, the Swedish modified version of the Postural Assessment Scale for Stroke Patients (SwePASS), to clinical practice, it is fundamental to analyze its measurement properties.Objective: To examine the inter-rater reliability of the SwePASS in the acute phase after stroke.
Methods: Day 3 to day 7 after admission to a stroke unit, 64 persons with stroke were assessed twice, using the SwePASS, by two physiotherapists. Inter-rater reliability was determined using percentage-agreement and the rank-invariant method: relative position, relative concentration, and relative rank variance.
Results: The raters showed a percentage agreement of ≥75% in the assessments using the SwePASS. For 9 of the 12 items, the percentage agreement was >80%. For 8 of the 12 items, there was a statistically significant change in position, revealed in relative position values between 0.08 and 0.15. Three items had statistically significant positive relative concentration values between ?0.11 and 0.10. Except for a statistically significant negligible relative variance value of 0.01 for the items 1 and 8, there was no relative variance.
Conclusions: The SwePASS shows an acceptable inter-rater reliability, albeit with potential for improvement. The reliability can be improved by a consensus how to interpret the scale between the raters prior to implementation in the clinic. 相似文献
29.
30.
Saisanjana Kalagara Adam E.M. Eltorai J. Mason DePasse Alan H. Daniels 《The spine journal》2019,19(1):182-185