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   3119篇
  免费   387篇
  国内免费   16篇
耳鼻咽喉   86篇
儿科学   72篇
妇产科学   54篇
基础医学   417篇
口腔科学   51篇
临床医学   345篇
内科学   606篇
皮肤病学   29篇
神经病学   177篇
特种医学   120篇
外科学   522篇
综合类   65篇
预防医学   421篇
眼科学   31篇
药学   287篇
中国医学   1篇
肿瘤学   238篇
  2021年   51篇
  2020年   37篇
  2019年   60篇
  2018年   65篇
  2017年   50篇
  2016年   41篇
  2015年   63篇
  2014年   84篇
  2013年   97篇
  2012年   136篇
  2011年   148篇
  2010年   78篇
  2009年   80篇
  2008年   106篇
  2007年   132篇
  2006年   116篇
  2005年   117篇
  2004年   133篇
  2003年   121篇
  2002年   127篇
  2001年   99篇
  2000年   141篇
  1999年   100篇
  1998年   32篇
  1997年   44篇
  1996年   31篇
  1995年   35篇
  1994年   30篇
  1993年   41篇
  1992年   65篇
  1991年   62篇
  1990年   48篇
  1989年   64篇
  1988年   44篇
  1987年   57篇
  1986年   70篇
  1985年   70篇
  1984年   38篇
  1983年   33篇
  1979年   38篇
  1978年   25篇
  1977年   25篇
  1975年   28篇
  1974年   30篇
  1973年   39篇
  1972年   33篇
  1971年   25篇
  1970年   28篇
  1969年   30篇
  1967年   28篇
排序方式: 共有3522条查询结果,搜索用时 0 毫秒
41.
Balloon occlusion is the accepted treatment for direct post-traumatic caroticocavernous fistula. We present a case of bilateral traumatic fistulae associated with a pseudoaneurysm. Resolution of both fistulae occurred following treatment of one of them by balloon occlusion of the internal carotid artery. This case highlights the importance of considering a more conservative approach to bilateral fistulae or those associated with a pseudoaneurysm. We review other treatment options. Received: 1 October 1999/Accepted: 20 October 1999  相似文献   
42.
Type 1 diabetes: pathogenesis and prevention   总被引:5,自引:0,他引:5       下载免费PDF全文
Type 1 diabetes results from the autoimmune destruction of insulin-producing β cells in the pancreas. Genetic and, as yet undefined, environmental factors act together to precipitate the disease. The excess mortality associated with the complications of type 1 diabetes and the increasing incidence of childhood type 1 diabetes emphasize the importance of therapeutic strategies to prevent this chronic disorder. Why is it considered that type 1 diabetes might be preventable? Different strands of diabetes research are coming together to suggest therapeutic targets. Islet cell autoantibody assays make it possible to accurately identify people at risk of future disease. In most cases, a long prodrome provides a window of opportunity to reverse the autoimmune process. Although no current “cure” exists, recent genetic data and preliminary trial results suggest T cells as a target for preventive strategies. Another potentially attainable target is induction of tolerance to the β-cell proteins such as insulin that are inappropriately recognized. Other strategies involve β-cell replacement, but currently there are insufficient donor cells available. This may be overcome as the processes controlling the differentiation of pancreatic and nonpancreatic progenitors as well as replication of existing islet β cells are unravelled.  相似文献   
43.
44.
45.
46.
47.
48.

Objectives

This document offers guidance to clinicians and facilities on the use of telemedicine to deliver medically necessary evaluation and management of change of condition for nursing home residents.

Settings and participants

Members of the telemedicine workgroup of AMDA—The Society for Post-Acute Long-Term Medicine-developed this guideline through both telephonic and face-to-face meetings between April 2017 and September 2018. The guideline is based on the currently available research, experience, and expertise of the workgroup's members, including a summary of a recently completed systematic mixed studies literature review to determine evidence for telemedicine to reduce emergency department visits or hospitalizations of nursing home residents.

Results

Research and experience to date support the use of telemedicine as a tool in change of condition assessment and management as a means of reducing unnecessary emergency department visits and hospitalization. Telemedicine-delivered care should be integrated into the primary care of the resident and delivered by providers with competency in post-acute long-term care. The development and sustainability of telemedicine programs is heavily dependent on financial implications. Quality measures should be defined for telemedicine programs in nursing homes.

Conclusions/Implications

Telemedicine programs in nursing homes can contribute to the delivery of timely, high quality medical care, which reduces unnecessary hospitalization. Reimbursement for telemedicine-driven care should be based upon medical necessity of visits to care and the maintenance of quality standards. More studies are needed to understand which telemedicine tools and processes are most effective in improving outcomes for nursing home residents.  相似文献   
49.
Exclusive breastfeeding (EBF) for the first 6 months has established benefits, yet had slow improvements globally. Little is known about electronic job aid‐assisted counselling to support EBF. As a secondary outcome of a cluster randomized controlled trial in Bangladesh, we assessed the effect of electronic job aid‐supported nutrition counselling and practical demonstration on EBF. We randomized pregnant women to one of five study arms in the trial and followed mother–child dyads until 2 years of age. Community health workers (CHWs) provided breastfeeding counselling with or without prenatal and complementary nutrient supplements in all four intervention arms. The comparison arm continued with the usual practice where mothers could receive nutrition counselling at routine antenatal and postnatal care, and during careseeking for childhood illnesses. We assessed breastfeeding indicators at birth and monthly until the child was 6 months old, in both intervention and comparison arms. To evaluate the effect of nutrition counselling on breastfeeding, we combined all four intervention arms and compared them with the comparison arm. Intervention newborns had half the risk (relative risk [RR]: 0.54, 95% confidence interval [CI]: 0.39, 0.76) of receiving prelacteal feeds than those in the comparison arm. EBF declined steeply in the comparison arm after 3 months of age. EBF was 16% higher in the intervention than the comparison arm at 4 months (RR: 1.16, 95% CI: 1.08, 1.23) and 22% higher at 5 months of age (RR: 1.22, 95% CI: 1.12, 1.33). Maternal background and household characteristics did not modify the intervention effect, and we observed no difference in EBF among caesarean versus vaginal births. Breastfeeding counselling and practical demonstration using an electronic job aid by CHWs are promising interventions to improve EBF and are scalable into existing community‐based programmes.  相似文献   
50.
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