全文获取类型
收费全文 | 24038篇 |
免费 | 3842篇 |
国内免费 | 87篇 |
专业分类
耳鼻咽喉 | 271篇 |
儿科学 | 882篇 |
妇产科学 | 741篇 |
基础医学 | 2422篇 |
口腔科学 | 652篇 |
临床医学 | 5263篇 |
内科学 | 4555篇 |
皮肤病学 | 569篇 |
神经病学 | 2316篇 |
特种医学 | 511篇 |
外国民族医学 | 1篇 |
外科学 | 3061篇 |
综合类 | 360篇 |
一般理论 | 30篇 |
预防医学 | 2906篇 |
眼科学 | 790篇 |
药学 | 1090篇 |
中国医学 | 24篇 |
肿瘤学 | 1523篇 |
出版年
2024年 | 91篇 |
2023年 | 601篇 |
2022年 | 275篇 |
2021年 | 633篇 |
2020年 | 614篇 |
2019年 | 533篇 |
2018年 | 1019篇 |
2017年 | 1021篇 |
2016年 | 991篇 |
2015年 | 1048篇 |
2014年 | 1294篇 |
2013年 | 1529篇 |
2012年 | 1286篇 |
2011年 | 1338篇 |
2010年 | 1101篇 |
2009年 | 1244篇 |
2008年 | 1085篇 |
2007年 | 1153篇 |
2006年 | 1046篇 |
2005年 | 981篇 |
2004年 | 915篇 |
2003年 | 863篇 |
2002年 | 843篇 |
2001年 | 465篇 |
2000年 | 346篇 |
1999年 | 421篇 |
1998年 | 414篇 |
1997年 | 391篇 |
1996年 | 417篇 |
1995年 | 335篇 |
1994年 | 316篇 |
1993年 | 278篇 |
1992年 | 271篇 |
1991年 | 272篇 |
1990年 | 243篇 |
1989年 | 229篇 |
1988年 | 216篇 |
1987年 | 210篇 |
1986年 | 183篇 |
1985年 | 164篇 |
1984年 | 142篇 |
1983年 | 120篇 |
1982年 | 112篇 |
1981年 | 84篇 |
1980年 | 76篇 |
1979年 | 90篇 |
1978年 | 91篇 |
1977年 | 75篇 |
1975年 | 51篇 |
1974年 | 56篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
A mixed‐method study of effects of a therapeutic play intervention for children on parental anxiety and parents' perceptions of the intervention 下载免费PDF全文
2.
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.3.
Emma J. Walker Noni E. MacDonald Nehal Islam Nicole Le Saux Karina A. Top Deshayne B. Fell 《Vaccine》2019,37(13):1725-1735
Objective
To systematically review literature on uptake and timeliness of diphtheria-tetanus-pertussis, measles-mumps-rubella, and/or polio-containing vaccines in infants who were born preterm, with a low birth weight, and/or with chronic health conditions that were diagnosed within the first 6?months of life.Methods
Using a standardized search strategy developed by a medical librarian, records were extracted from MEDLINE, Embase, Database of Abstracts of Reviews of Effects, and CINAHL up to May 8, 2018.Results
Out of the 1997 records that were screened, we identified 21 studies that met inclusion criteria. Eleven studies assessed vaccine coverage and/or timeliness in preterm infants, 6 in low birth weight infants, and 7 in children with chronic health conditions. Estimates of coverage in these populations were highly variable, ranging from 40% to 100% across the vaccines and population groups.Conclusions
There is a lack of studies reporting coverage and timeliness of routine immunizations in special populations of children.Policy implications
Our review suggests a need for improved surveillance of immunization status in special populations of infants, as well as a need for standardization of reporting practices. 相似文献4.
5.
Evaluation of training nurses to perform semi‐automated three‐dimensional left ventricular ejection fraction using a customised workstation‐based training protocol 下载免费PDF全文
6.
Recognizing and managing a deteriorating patient: a randomized controlled trial investigating the effectiveness of clinical simulation in improving clinical performance in undergraduate nursing students 下载免费PDF全文
7.
8.
Fluid role boundaries: exploring the contribution of the advanced nurse practitioner to multi‐professional palliative care 下载免费PDF全文
9.
10.