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   1862696篇
  免费   169056篇
  国内免费   4891篇
耳鼻咽喉   28283篇
儿科学   61957篇
妇产科学   51401篇
基础医学   249737篇
口腔科学   52601篇
临床医学   176060篇
内科学   379978篇
皮肤病学   44500篇
神经病学   156125篇
特种医学   75830篇
外国民族医学   474篇
外科学   300738篇
综合类   40696篇
现状与发展   76篇
一般理论   629篇
预防医学   136913篇
眼科学   42381篇
药学   130978篇
  2篇
中国医学   3171篇
肿瘤学   104113篇
  2021年   14786篇
  2018年   24605篇
  2017年   20848篇
  2016年   23493篇
  2015年   25366篇
  2014年   37855篇
  2013年   50948篇
  2012年   55058篇
  2011年   58087篇
  2010年   40235篇
  2009年   41250篇
  2008年   55977篇
  2007年   57108篇
  2006年   59795篇
  2005年   55726篇
  2004年   53907篇
  2003年   50988篇
  2002年   49974篇
  2001年   82953篇
  2000年   85886篇
  1999年   72026篇
  1998年   22223篇
  1997年   20357篇
  1996年   20023篇
  1995年   19490篇
  1994年   17389篇
  1993年   16191篇
  1992年   57202篇
  1991年   55534篇
  1990年   53979篇
  1989年   52391篇
  1988年   48512篇
  1987年   47820篇
  1986年   45466篇
  1985年   44075篇
  1984年   33101篇
  1983年   28506篇
  1982年   17123篇
  1981年   15255篇
  1979年   31155篇
  1978年   21746篇
  1977年   18519篇
  1976年   17257篇
  1975年   18166篇
  1974年   22024篇
  1973年   21150篇
  1972年   19364篇
  1971年   18198篇
  1970年   16749篇
  1969年   15551篇
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
131.
132.
133.

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   
134.
BackgroundThe measurement of health-related quality of life (HRQoL) provides information about the perceived burden of the health condition and treatments from a lived experience. The Brisbane Burn Scar Impact Profile (caregiver report for young children, BBSIP0–8), developed in 2013, is a proxy-report measure of burn scar-specific HRQoL. The aim of this study was to report its psychometric properties in line with an evaluative purpose.MethodsCaregivers of children up to 8 years of age at risk of burn scarring were recruited into a prospective, longitudinal cohort study. Caregivers completed the BBSIP0–8, Pediatric Quality of Life Inventory and Patient Observer Scar Assessment Scale at baseline (approximately ≥85% of the total body surface area re-epithelialised), 1–2 weeks after baseline and 1-month after baseline. Psychometric properties measured included internal consistency, test–retest reliability, validity and responsiveness.ResultsEighty-six caregivers of mostly male children (55%), of a median age (IQR) of 1 year, 10 months (2 years, 1 month) and total body surface area burn of 1.5% (3.0%) were recruited. Over one third of participants were grafted and 15% had contractures or skin tightness at baseline. Internal consistency of ten item groups ranged from 0.73 to 0.96. Hypothesised correlations of changes in the BBSIP0–8 items with changes in criterion measures supported longitudinal validity (ρ ranging from ?0.73 to 0.68). The majority of item groups had acceptable reproducibility (ICC = 0.65–0.83). The responsiveness of five item groups was supported (AUC = 0.71–0.90).ConclusionThe psychometric properties tested support the use of the BBSIP0–8 as an evaluative measure of burn scar-related health-related quality of life for children aged below eight years in the early post-acute period of rehabilitation. Further investigation at longer time period after burn injury is indicated.  相似文献   
135.
136.
137.
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   
138.
139.
140.
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