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   1708篇
  免费   101篇
  国内免费   7篇
耳鼻咽喉   6篇
儿科学   72篇
妇产科学   10篇
基础医学   234篇
口腔科学   16篇
临床医学   124篇
内科学   398篇
皮肤病学   36篇
神经病学   174篇
特种医学   35篇
外科学   286篇
综合类   6篇
一般理论   30篇
预防医学   169篇
眼科学   11篇
药学   47篇
中国医学   1篇
肿瘤学   161篇
  2022年   5篇
  2021年   16篇
  2020年   17篇
  2019年   21篇
  2018年   30篇
  2017年   34篇
  2016年   30篇
  2015年   39篇
  2014年   46篇
  2013年   58篇
  2012年   93篇
  2011年   103篇
  2010年   70篇
  2009年   65篇
  2008年   127篇
  2007年   109篇
  2006年   115篇
  2005年   110篇
  2004年   96篇
  2003年   102篇
  2002年   103篇
  2001年   20篇
  2000年   10篇
  1999年   17篇
  1998年   22篇
  1997年   30篇
  1996年   19篇
  1995年   28篇
  1994年   20篇
  1993年   15篇
  1992年   10篇
  1991年   26篇
  1990年   11篇
  1989年   13篇
  1988年   12篇
  1987年   5篇
  1986年   9篇
  1985年   10篇
  1984年   7篇
  1983年   14篇
  1982年   17篇
  1981年   14篇
  1980年   5篇
  1979年   11篇
  1977年   10篇
  1976年   10篇
  1975年   10篇
  1974年   8篇
  1967年   6篇
  1963年   4篇
排序方式: 共有1816条查询结果,搜索用时 31 毫秒
1.
Abstract

With increased interest in the use of entrustable professional activities (EPAs) in undergraduate and postgraduate medical education, comes questions about their implications for curriculum development and assessment. This paper addresses some of those questions, discussed at a symposium of the 2017 conference of AMEE, by presenting the components of an EPA, describing their importance and application, identifying their implications for assessment, and pinpointing some of challenges they pose in undergraduate and postgraduate settings. It defines entrustment, describes the three levels of trust, and presents trainee and supervisor factors that influence it as well as perceived benefits, and risks. Two aspects of EPAs have implications for assessment: units of professional practice and decisions based on entrustment, which impact an assessment’s blueprint, test methods, scores, and standards. In an undergraduate setting EPAs have great appeal, but work is needed to identify and develop a robust assessment system for core EPAs. At the postgraduate level, there is tension between the granularity of the competencies and the integrated nature of the EPAs. Even though work remains, EPAs offer an important step in the evolution of competency-based education.  相似文献   
2.
3.
4.

Background and purpose

We have previously shown that during the first 2 years after total hip arthroplasty (THA), periprosthetic bone resorption can be prevented by 6 months of risedronate therapy. This follow-up study investigated this effect at 4 years.

Patients and methods

A single-center, double-blind, randomized placebo-controlled trial was carried out from 2006 to 2010 in 73 patients with osteoarthritis of the hip who were scheduled to undergo THA. The patients were randomly assigned to receive either 35 mg risedronate or placebo orally, once a week, for 6 months postoperatively. The primary outcome was the percentage change in bone mineral density (BMD) in Gruen zones 1 and 7 in the proximal part of the femur at follow-up. Secondary outcomes included migration of the femoral stem and clinical outcome scores.

Results

61 of the 73 patients participated in this 4-year (3.9- to 4.1-year) follow-up study. BMD was similar in the risedronate group (n = 30) and the placebo group (n = 31). The mean difference was −1.8% in zone 1 and 0.5% in zone 7. Migration of the femoral stem, the clinical outcome, and the frequency of adverse events were similar in the 2 groups.

Interpretation

Although risedronate prevents periprosthetic bone loss postoperatively, a decrease in periprosthetic BMD accelerates when therapy is discontinued, and no effect is seen at 4 years. We do not recommend the use of risedronate following THA for osteoarthritis of the hip.Adaptive bone remodeling around the femoral stem following total hip arthroplasty (THA) results in regional loss of bone mass, especially in proximal parts of the femur—most of which takes place within the first postoperative year (Bodén et al. 2006, Sköldenberg et al. 2006). Periprosthetic bone loss may predispose to periprosthetic fracture, aseptic loosening, and difficulties at revision surgery (Lindahl 2007, Streit et al. 2011, Sköldenberg et al. 2014).The bisphosphonate (BP) risedronate has been used successfully to prevent osteoporotic fractures, mainly in the hip and vertebrae, by inhibiting osteoclast activity (McClung et al. 2001). In recent years, the possible use of BPs to prevent or ameliorate periprosthetic adaptive bone resorption, osteolysis, and implant migration has been investigated thoroughly in animal models and humans. The short-term results of several studies showing the effects of postoperative BP treatment in reducing periprosthetic bone loss up to a year after the arthroplasty have already been published (Venesmaa et al. 2001, Wilkinson et al. 2001, Hennigs et al. 2002, Wilkinson et al. 2005, Arabmotlagh et al. 2006).We have previously found that risedronate given once a week for 6 months after THA reduces periprosthetic bone resorption around an uncemented femoral stem in the first and second postoperative year (Sköldenberg et al. 2011). We now report the 4-year outcome in the same cohort.  相似文献   
5.
6.
Pancreatic islet transplantation is a treatment option for patients with type 1 diabetes (T1D), but pregnancy has generally not been advised for women after receiving an islet allograft. We hereby describe what is to our knowledge the first successful pregnancy and persistent graft function in a woman 4 years after her initial islet transplantation. A 37‐year‐old woman with brittle type 1 diabetes was transplanted with two separate islet graft infusions, eventually becoming insulin independent. Ten months after her second transplantation, her immunosuppression was switched from tacrolimus and sirolimus to tacrolimus, azathioprine, and prednisolone, due to her wish to become pregnant. She became pregnant one year later, and after 38 weeks of uncomplicated pregnancy, she gave birth to a healthy child by C‐section. The current report suggests that pregnancy and childbirth can be accomplished after islet transplantation without loss of islet graft function.  相似文献   
7.
Journal of Clinical Immunology - Coronavirus disease 2019 (COVID-19) exhibits a wide spectrum of clinical manifestations, ranging from asymptomatic to critical conditions. Understanding the...  相似文献   
8.
Journal of Clinical Immunology - Inborn errors of immunity (IEI) and autoantibodies to type I interferons (IFNs) underlie critical COVID-19 pneumonia in at least 15% of the patients, while the...  相似文献   
9.
10.
The pre- and postoperative cineradiographic findings in 14 dysphagic patients who underwent cricopharyngeal myotomy were compared. The reason for the operation was Zenker's diverticulum (7 patients), lack of cricopharyngeal coordination (5 patients), or a cervical esophageal web (2 patients). After the operation the function of the epiglottis, laryngeal vestibule, and pharyngeal constrictors was unaltered (11 patients) or improved (3 patients), although 4 cases showed residual impression due to the cricopharyngeal muscle. Postoperatively, 9 patients developed defective peristalsis and 10 had impaired tonicity of the cervical esophagus. It is concluded that myotomy alters the motor function of the pharyngoesophageal segment considerably. Moreover, certain functions of the pharynx proper are changed by this procedure.  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