全文获取类型
| 收费全文 | 4071844篇 |
| 免费 | 301667篇 |
| 国内免费 | 10213篇 |
专业分类
| 耳鼻咽喉 | 57472篇 |
| 儿科学 | 130348篇 |
| 妇产科学 | 111124篇 |
| 基础医学 | 568451篇 |
| 口腔科学 | 116939篇 |
| 临床医学 | 375157篇 |
| 内科学 | 789257篇 |
| 皮肤病学 | 91238篇 |
| 神经病学 | 338004篇 |
| 特种医学 | 158542篇 |
| 外国民族医学 | 1438篇 |
| 外科学 | 609998篇 |
| 综合类 | 91172篇 |
| 现状与发展 | 6篇 |
| 一般理论 | 1720篇 |
| 预防医学 | 325252篇 |
| 眼科学 | 94693篇 |
| 药学 | 301247篇 |
| 11篇 | |
| 中国医学 | 7982篇 |
| 肿瘤学 | 213673篇 |
出版年
| 2018年 | 43660篇 |
| 2017年 | 33586篇 |
| 2016年 | 38156篇 |
| 2015年 | 43062篇 |
| 2014年 | 60632篇 |
| 2013年 | 92053篇 |
| 2012年 | 122321篇 |
| 2011年 | 129805篇 |
| 2010年 | 77836篇 |
| 2009年 | 74422篇 |
| 2008年 | 121821篇 |
| 2007年 | 129402篇 |
| 2006年 | 131158篇 |
| 2005年 | 126797篇 |
| 2004年 | 122196篇 |
| 2003年 | 117809篇 |
| 2002年 | 114652篇 |
| 2001年 | 187044篇 |
| 2000年 | 192533篇 |
| 1999年 | 163293篇 |
| 1998年 | 48481篇 |
| 1997年 | 43265篇 |
| 1996年 | 42903篇 |
| 1995年 | 41613篇 |
| 1994年 | 38637篇 |
| 1993年 | 36150篇 |
| 1992年 | 129754篇 |
| 1991年 | 125526篇 |
| 1990年 | 121333篇 |
| 1989年 | 117243篇 |
| 1988年 | 108362篇 |
| 1987年 | 106745篇 |
| 1986年 | 100817篇 |
| 1985年 | 96578篇 |
| 1984年 | 72638篇 |
| 1983年 | 62030篇 |
| 1982年 | 37354篇 |
| 1981年 | 33615篇 |
| 1979年 | 66747篇 |
| 1978年 | 47233篇 |
| 1977年 | 40022篇 |
| 1976年 | 37492篇 |
| 1975年 | 39594篇 |
| 1974年 | 47988篇 |
| 1973年 | 45810篇 |
| 1972年 | 43106篇 |
| 1971年 | 39923篇 |
| 1970年 | 37306篇 |
| 1969年 | 35274篇 |
| 1968年 | 32451篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
31.
32.
33.
34.
35.
36.
37.
38.
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39.
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40.
A.B. Sanchez-Spitman J.J. Swen V.O. Dezentje D.J.A.R. Moes H. Gelderblom 《Expert review of clinical pharmacology》2019,12(6):523-536
Introduction: Tamoxifen dominates the anti-estrogenic therapy in the early and metastatic breast cancer setting. Tamoxifen has a complex metabolism, being mainly metabolized by CYP2D6 into its 30–100 times more potent metabolite, endoxifen. Recently, a phase I study in which endoxifen as an orally z-endoxifen hydrochloride has been successfully evaluated.
Areas covered: the principal pharmacogenetic and non-genetic differences in the pharmacology of tamoxifen and endoxifen are evaluated. To this end, references from PubMed, Embase or Web of Science, among others, were reviewed As non-genetic factors, important differences and similarities such age, or adherence to tamoxifen therapy are comprehensively illustrated. Additionally, since CYP2D6 genotypes are considered the main limitation of tamoxifen, many studies have investigated the association between the worsened clinical outcomes in patients with non-functional CYP2D6 genotypes. In this review, an overview of the research on this field is presented. Also, a summary describing the literature about individualizing tamoxifen therapy with endoxifen concentrations and its limitations is listed.
Expert opinion: z-endoxifen hydrochloride is only investigated in the metastatic setting, still more research is required before its place in therapeutics is known. Similarly, monitoring tamoxifen efficacy based on endoxifen concentrations might not be overall recommended due to the limited evidence available. 相似文献