首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1449838篇
  免费   111191篇
  国内免费   13464篇
耳鼻咽喉   19781篇
儿科学   44106篇
妇产科学   40180篇
基础医学   207892篇
口腔科学   38574篇
临床医学   131322篇
内科学   276190篇
皮肤病学   28615篇
神经病学   108224篇
特种医学   56221篇
外国民族医学   463篇
外科学   215279篇
综合类   55714篇
现状与发展   40篇
一般理论   322篇
预防医学   104148篇
眼科学   33666篇
药学   116901篇
  187篇
中国医学   13350篇
肿瘤学   83318篇
  2021年   16997篇
  2020年   12004篇
  2019年   14202篇
  2018年   18293篇
  2017年   14870篇
  2016年   15591篇
  2015年   20171篇
  2014年   26374篇
  2013年   33921篇
  2012年   47503篇
  2011年   51049篇
  2010年   30890篇
  2009年   27437篇
  2008年   44781篇
  2007年   47233篇
  2006年   47414篇
  2005年   46484篇
  2004年   41907篇
  2003年   40380篇
  2002年   39055篇
  2001年   61339篇
  2000年   63021篇
  1999年   54269篇
  1998年   16428篇
  1997年   15081篇
  1996年   14810篇
  1995年   14046篇
  1994年   13236篇
  1992年   42146篇
  1991年   41384篇
  1990年   40703篇
  1989年   39453篇
  1988年   36790篇
  1987年   35868篇
  1986年   34125篇
  1985年   32482篇
  1984年   24089篇
  1983年   20953篇
  1982年   12455篇
  1979年   22723篇
  1978年   15923篇
  1977年   13772篇
  1976年   13004篇
  1975年   14225篇
  1974年   16715篇
  1973年   16101篇
  1972年   15334篇
  1971年   14241篇
  1970年   13229篇
  1969年   12741篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
103.
104.

Background

Arterial vascular anomalies in patients undergoing kidney transplantation (KT) are correlated with a higher incidence of early surgical complications, potentially causing graft loss. Arterial reconstruction allows patients to overcome these surgical challenges, thus minimizing the risk of poor outcomes. The aim of the present study is to retrospectively investigate the safety and effectiveness of the multiple arterial reconstruction technique with a Teflon patch in case of an unavailable aortic patch: to do so, surgical complications, graft function, and patient survival were evaluated.

Methods

During the period January 2009 to August 2016, 202 adult deceased-donor KTs were performed at our center. Group A (n = 27; reconstruction of multiple arteries) and Group B (n = 175; control group) were compared.

Results

No differences were observed between the 2 groups in terms of early postoperative course, with no vascular complication observed in Group A. No vascular patch infections were reported, nor longer cold ischemia time rates. Similarly, long-term survival rates were similar between the 2 groups.

Conclusions

The Teflon-patch arterial reconstruction technique appears to be safe and effective, with an acceptable balance of benefits and potential risks of using a prosthetic material. Studies based on larger series are needed to further validate this approach.  相似文献   
105.
To evaluate the anthropometric indexes in subjects with varicocele compared to controls and the incidence of varicocele in different body mass index (BMI) groups for the purpose of exploring the association between varicocele and anthropometric indexes. A comprehensive literature search was conducted by using PubMed, MEDLINE, EMBASE databases and Cochrane Library up to February 2019. A systematic review and meta‐analysis was conducted by STATA, and Newcastle–Ottawa Scale was utilised for assessing risk of bias. Ultimately, 13 articles containing seven case–control studies and six cross‐sectional studies with 1,385,630 subjects were involved in our study. Pooled results demonstrated that varicocele patients had a lower BMI (WMD = ?0.77, 95% CI = ?1.03 to ?0.51) and a higher height than nonvaricocele participants, especially in grade 3 varicocele patients. Subgroup analyses showed that normal BMI individuals had a higher risk of varicocele than obese or overweight individuals and a lower risk than underweight individuals. In conclusion, this study indicates that varicocele patients have a lower BMI and a higher height than nonvaricocele participants. Moreover, men with excess bodyweight have a lower incidence of varicocele compared to normal weight or underweight people. That is to say, high BMI and adiposity protect against varicocele and high BMI is associated with a decreased risk of varicocele.  相似文献   
106.
107.
108.
109.
110.
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   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号