全文获取类型
收费全文 | 159157篇 |
免费 | 10770篇 |
国内免费 | 625篇 |
专业分类
耳鼻咽喉 | 1770篇 |
儿科学 | 3906篇 |
妇产科学 | 2618篇 |
基础医学 | 20986篇 |
口腔科学 | 3392篇 |
临床医学 | 15587篇 |
内科学 | 33678篇 |
皮肤病学 | 3243篇 |
神经病学 | 14695篇 |
特种医学 | 6968篇 |
外国民族医学 | 14篇 |
外科学 | 25255篇 |
综合类 | 1967篇 |
一般理论 | 109篇 |
预防医学 | 11863篇 |
眼科学 | 3321篇 |
药学 | 10170篇 |
中国医学 | 238篇 |
肿瘤学 | 10772篇 |
出版年
2023年 | 886篇 |
2022年 | 1489篇 |
2021年 | 3377篇 |
2020年 | 2079篇 |
2019年 | 3121篇 |
2018年 | 3591篇 |
2017年 | 2804篇 |
2016年 | 3146篇 |
2015年 | 3591篇 |
2014年 | 5097篇 |
2013年 | 6855篇 |
2012年 | 10350篇 |
2011年 | 11026篇 |
2010年 | 6315篇 |
2009年 | 6019篇 |
2008年 | 9764篇 |
2007年 | 10205篇 |
2006年 | 10106篇 |
2005年 | 10151篇 |
2004年 | 9321篇 |
2003年 | 8636篇 |
2002年 | 8279篇 |
2001年 | 2165篇 |
2000年 | 1857篇 |
1999年 | 2135篇 |
1998年 | 1928篇 |
1997年 | 1555篇 |
1996年 | 1337篇 |
1995年 | 1254篇 |
1994年 | 1129篇 |
1993年 | 1017篇 |
1992年 | 1305篇 |
1991年 | 1196篇 |
1990年 | 1050篇 |
1989年 | 993篇 |
1988年 | 924篇 |
1987年 | 889篇 |
1986年 | 892篇 |
1985年 | 869篇 |
1984年 | 926篇 |
1983年 | 801篇 |
1982年 | 964篇 |
1981年 | 861篇 |
1980年 | 733篇 |
1979年 | 654篇 |
1978年 | 652篇 |
1977年 | 538篇 |
1976年 | 516篇 |
1974年 | 513篇 |
1973年 | 452篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
Frédéric Janvier Deborah Delaune Thomas Poyot Eric Valade Audrey Mérens Pierre E. Rollin Vincent Foissaud 《Emerging infectious diseases》2016,22(2):292-294
We evaluated RNA stability of Ebola virus in EDTA blood and urine samples collected from infected patients and stored in West Africa’s environmental conditions. In blood, RNA was stable for at least 18 days when initial cycle threshold values were <30, but in urine, RNA degradation occurred more quickly. 相似文献
22.
23.
24.
25.
26.
27.
28.
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29.
Michelle Linda Ferderbar Thomas E. Doyle Reza Samavi David Koff 《Journal l'Association canadienne des radiologistes》2019,70(2):119-124
Several regulatory bodies have agreed that low-dose radiation used in medical imaging is a weak carcinogen that follows a linear, non-threshold model of cancer risk. While avoiding radiation is the best course of action to mitigate risk, computed tomography (CT) scans are often critical for diagnosis. In addition to the as low as reasonably achievable principle, a more concrete method of dose reduction for common CT imaging exams is the use of a diagnostic reference level (DRL). This paper examines Canada's national DRL values from the recent CT survey and compares it to published provincial DRLs as well as the DRLs in the United Kingdom and the United States of America for the 3 most common CT exams: head, chest, and abdomen/pelvis. Canada compares well on the international scale, but it should consider using more electronic dose monitoring solutions to create a culture of dose optimization. 相似文献
30.
Health care expenditure in Germany shows clear regional differences. Such geographic variations are often seen as an indicator for inefficiency. With its homogeneous health care system, low co‐payments and uniform prices, Germany is a particularly suited example to analyse regional variations. We use data for the year 2011 on expenditure, utilization of health services and state of health in Germany's statutory health insurance system. This data, which originate from a variety of administrative sources and cover about 90% of the population, are enriched with a wealth of socio‐economic variables, data on pollutants, prices and individual preferences. State of health and demography explains 55% of the differences as measured by the standard deviation while all control variables account for a total of 72% of the differences at county level. With other measures of variation, we can account for an even greater proportion. A higher proportion of variation than usually supposed can thus be explained. Whilst this study cannot quantify inefficiencies, our results contradict the thesis that regional variations reflect inefficiency. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献