全文获取类型
收费全文 | 2587347篇 |
免费 | 184974篇 |
国内免费 | 7569篇 |
学科分类
医药卫生 | 2779890篇 |
出版年
2021年 | 19981篇 |
2019年 | 20622篇 |
2018年 | 29285篇 |
2017年 | 22592篇 |
2016年 | 26224篇 |
2015年 | 29501篇 |
2014年 | 40437篇 |
2013年 | 60418篇 |
2012年 | 80217篇 |
2011年 | 84478篇 |
2010年 | 50998篇 |
2009年 | 49140篇 |
2008年 | 79017篇 |
2007年 | 83831篇 |
2006年 | 85562篇 |
2005年 | 81723篇 |
2004年 | 78720篇 |
2003年 | 76036篇 |
2002年 | 73327篇 |
2001年 | 128406篇 |
2000年 | 131329篇 |
1999年 | 110497篇 |
1998年 | 31252篇 |
1997年 | 27919篇 |
1996年 | 28217篇 |
1995年 | 27383篇 |
1994年 | 25067篇 |
1993年 | 23419篇 |
1992年 | 85159篇 |
1991年 | 81563篇 |
1990年 | 78783篇 |
1989年 | 76059篇 |
1988年 | 69468篇 |
1987年 | 67996篇 |
1986年 | 63542篇 |
1985年 | 60510篇 |
1984年 | 44940篇 |
1983年 | 37943篇 |
1982年 | 22456篇 |
1981年 | 19984篇 |
1979年 | 38959篇 |
1978年 | 27439篇 |
1977年 | 23252篇 |
1976年 | 21495篇 |
1975年 | 22814篇 |
1974年 | 26786篇 |
1973年 | 25370篇 |
1972年 | 23749篇 |
1971年 | 21955篇 |
1970年 | 20183篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
Stelter K. Theodoraki M. N. Becker S. Tsekmistrenko V. Olzowy B. Ledderose G. 《European archives of oto-rhino-laryngology》2015,272(3):639-639
European Archives of Oto-Rhino-Laryngology - 相似文献
42.
Haya Mohammed BSc MChB M. Yousuf Salmasi MRCS Massimo Caputo PhD Gianni D. Angelini PhD Hunaid A. Vohra PhD 《Journal of cardiac surgery》2020,35(6):1209-1219
Background
Limited data exists demonstrating the efficacy of minimally invasive surgery (MIS) compared to median sternotomy (MS) for multiple valvular disease (MVD). This systematic review and meta-analysis aims to compare operative and peri-operative outcomes of MIS vs MS in MVD.Methods
PubMed, Ovid, and Embase were searched from inception until August 2019 for randomized and observational studies comparing MIS and MS in patients with MVD. Clinical outcomes of intra- and postoperative times, reoperation for bleeding and surgical site infection were evaluated.Results
Five observational studies comparing 340 MIS vs 414 MS patients were eligible for qualitative and quantitative review. The quality of evidence assessed using the Newcastle-Ottawa scale was good for all included studies. Meta-analysis demonstrated increased cardiopulmonary bypass time for MIS patients (weighted mean difference [WMD], 0.487; 95% confidence interval [CI], 0.365-0.608; P < .0001). Similarly, aortic cross-clamp time was longer in patients undergoing MIS (WMD, 0.632; 95% CI, 0.509-0.755; P < .0001). No differences were found in operative mortality, reoperation for bleeding, surgical site infection, or hospital stay.Conclusions
MIS for MVD have similar short-term outcomes compared to MS. This adds value to the use of minimally invasive methods for multivalvular surgery, despite conferring longer operative times. However, the paucity in literature and learning curve associated with MIS warrants further evidence, ideally randomized control trials, to support these findings.43.
44.
45.
46.
Michael E Egger Joanna M Ohlendorf Charles R Scoggins Kelly M McMasters Robert C G Martin II 《HPB : the official journal of the International Hepato Pancreato Biliary Association》2015,17(9):839-845
BackgroundThe aim of this paper is to assess the current state of quality and outcomes measures being reported for hepatic resections in the recent literature.MethodsMedline and PubMed databases were searched for English language articles published between 1 January 2002 and 30 April 2013. Two examiners reviewed each article and relevant citations for appropriateness of inclusion, which excluded papers of liver donor hepatic resections, repeat hepatectomies or meta-analyses. Data were extracted and summarized by two examiners for analysis.ResultsFifty-five studies were identified with suitable reporting to assess peri-operative mortality in hepatic resections. In only 35% (19/55) of the studies was the follow-up time explicitly stated, and in 47% (26/55) of studies peri-operative mortality was limited to in-hospital or 30 days. The time period in which complications were captured was not explicitly stated in 19 out of 28 studies. The remaining studies only captured complications within 30 days of the index operation (8/28). There was a paucity of quality literature addressing truly patient-centred outcomes.ConclusionQuality outcomes after a hepatic resection are inconsistently reported in the literature. Quality outcome studies for a hepatectomy should report mortality and morbidity at a minimum of 90 days after surgery. 相似文献
47.
48.
49.
50.
Iclea Rocha Gama Euclides Marinho Trindade-Filho Suzana Lima Oliveira Nassib Bezerra Bueno Isabelle Tenório Melo Cyro Rego Cabral-Junior Elenita M. Barros Jaqueline A. Galvão Wanessa S. Pereira Raphaela C. Ferreira Bruna R. Domingos Terezinha da Rocha Ataide 《Metabolic brain disease》2015,30(1):93-98