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   4465268篇
  免费   354930篇
  国内免费   15555篇
耳鼻咽喉   60984篇
儿科学   141871篇
妇产科学   116425篇
基础医学   680012篇
口腔科学   123864篇
临床医学   406845篇
内科学   808476篇
皮肤病学   109121篇
神经病学   371162篇
特种医学   175353篇
外国民族医学   524篇
外科学   680723篇
综合类   132907篇
现状与发展   24篇
一般理论   2587篇
预防医学   371160篇
眼科学   105768篇
药学   312994篇
  28篇
中国医学   12557篇
肿瘤学   222368篇
  2021年   56400篇
  2020年   35822篇
  2019年   59055篇
  2018年   74766篇
  2017年   57074篇
  2016年   63269篇
  2015年   76398篇
  2014年   110919篇
  2013年   176511篇
  2012年   123391篇
  2011年   128715篇
  2010年   126546篇
  2009年   127606篇
  2008年   114483篇
  2007年   122042篇
  2006年   130209篇
  2005年   125014篇
  2004年   126278篇
  2003年   115867篇
  2002年   104586篇
  2001年   173482篇
  2000年   169286篇
  1999年   153559篇
  1998年   73326篇
  1997年   68703篇
  1996年   66789篇
  1995年   62450篇
  1994年   56379篇
  1993年   52398篇
  1992年   112057篇
  1991年   107742篇
  1990年   103066篇
  1989年   100267篇
  1988年   92348篇
  1987年   90399篇
  1986年   85478篇
  1985年   83770篇
  1984年   69646篇
  1983年   61610篇
  1982年   48901篇
  1981年   45433篇
  1980年   42666篇
  1979年   59454篇
  1978年   47775篇
  1977年   42546篇
  1976年   39303篇
  1975年   39083篇
  1974年   42938篇
  1973年   41359篇
  1972年   38603篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
ABSTRACT

A monocausal bacteriological understanding of infectious disease orients tuberculosis control efforts towards antimicrobial interventions. A bias towards technological solutions can leave multistranded public health and social interventions largely neglected. In the context of globalising biomedical approaches to infectious disease control, this ethnography-inspired review article reflects upon the implementation of rapid diagnostic technology in low- and middle-income countries. Fieldwork observations in Vietnam provided a stimulus for a critical review of the global rollout of tuberculosis diagnostic technology. To address local needs in tuberculosis control, health managers in resource-poor settings are readily cooperating with international donors to deploy novel diagnostic technologies throughout national tuberculosis programme facilities. Increasing investment in new diagnostic technologies is predicated on the supposition that these interventions will ameliorate disease outcomes. However, suboptimal treatment control persists even when accurate diagnostic technologies are available, suggesting that promotion of singular technological solutions can distract from addressing systemic change, without which disease susceptibility, propagation of infection, detection gaps, diagnostic delays, and treatment shortfalls persist.  相似文献   
62.
63.
64.
65.
66.
67.
68.
69.

Background

Nursing Home Compare (NHC) ratings, created and maintained by Medicare, are used by both hospitals and consumers to aid in the skilled nursing facility (SNF) selection process. To date, no studies have linked NHC ratings to actual episode-based outcomes. The purpose of this study was to evaluate whether NHC ratings are valid predictors of 90-day complications, readmission, and bundle costs for patients discharged to an SNF after primary total joint arthroplasty (TJA).

Methods

All SNF-discharged primary TJA cases in 2017 at a multihospital academic health system were queried. Demographic, psychosocial, and clinical variables were manually extracted from the health record. Medicare NHC ratings were then collected for each SNF. For patients in the Medicare bundle, postacute and total bundle cost was extracted from claims.

Results

Four hundred eighty-eight patients were discharged to a total of 105 unique SNFs. In multivariate analysis, overall NHC rating was not predictive of 90-day readmission/major complications, >75th percentile postacute cost, or 90-day bundle cost exceeding the target price. SNF health inspection and quality measure ratings were also not predictive of 90-day readmission/major complications or bundle performance. A higher SNF staffing rating was independently associated with a decreased odds for >75th percentile 90-day postacute spend (odds ratio, 0.58; P = .01) and a 90-day bundle cost exceeding the target price (odds ratio = 0.69; P = .02) but was similarly not predictive of 90-day readmission/complications.

Conclusion

Results of our study suggest that Medicare's NHC tool is not a useful predictor of 90-day costs, complications, or readmissions for SNFs within our health system.  相似文献   
70.
Purpose/aim: To focus on current aspects of primary thyroid lymphoma (PTL), which is a rare clinical entity usually manifested by a rapidly growing mass in the neck that can cause pressure symptoms.

Materials and Methods: Relevant papers in PubMed published through June 2017 were selected to track updated information about PTL with an emphasis on diagnosis and novel therapeutic management.

Results: The most frequent cases include non-Hodgkin lymphoma derived from B-cells, mainly diffuse large B-cell lymphoma (DLBCL) followed by mucosa-associated lymphoid tissue (MALT) lymphoma or a mixed type. Other subtypes are less common. Lymphomas derived from T-cells and Hodgkin lymphomas are extremely rare. Hashimoto's autoimmune thyroiditis has been implicated as a risk factor for lymphoma. At the molecular level, the Wnt5a protein and its receptor Ror2 are involved in the course of the disease. Ultrasonography, fine needle aspiration (FNA) biopsy, and core or open biopsy combined with new diagnostic facilities contribute to an accurate diagnosis. An increased potential exists for a cure without the need for a radical surgical procedure. Modern chemoradiation therapy plus the monoclonal antibody rituximab, which acts against CD20, have limited the need for surgical interventions and provide an excellent outcome in most cases. However, some cases have resulted in treatment failure or recurrence.

Conclusions: A multidisciplinary approach must be used to define the management policy in each case. Future efforts by researchers are likely to be focused on the molecular level.  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