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   5430719篇
  免费   404258篇
  国内免费   15665篇
耳鼻咽喉   77181篇
儿科学   174756篇
妇产科学   145362篇
基础医学   804007篇
口腔科学   151023篇
临床医学   503632篇
内科学   988592篇
皮肤病学   127883篇
神经病学   446869篇
特种医学   209634篇
外国民族医学   1156篇
外科学   812908篇
综合类   148105篇
现状与发展   24篇
一般理论   3063篇
预防医学   452971篇
眼科学   130482篇
药学   388528篇
  28篇
中国医学   13892篇
肿瘤学   270546篇
  2021年   57493篇
  2019年   59713篇
  2018年   77773篇
  2017年   59701篇
  2016年   66377篇
  2015年   78124篇
  2014年   112665篇
  2013年   178441篇
  2012年   158725篇
  2011年   170276篇
  2010年   136783篇
  2009年   134508篇
  2008年   155060篇
  2007年   167578篇
  2006年   174079篇
  2005年   168029篇
  2004年   167949篇
  2003年   157258篇
  2002年   145910篇
  2001年   215922篇
  2000年   213702篇
  1999年   190218篇
  1998年   78221篇
  1997年   71925篇
  1996年   70077篇
  1995年   65341篇
  1994年   59296篇
  1993年   54851篇
  1992年   140773篇
  1991年   135930篇
  1990年   131596篇
  1989年   128119篇
  1988年   118181篇
  1987年   115876篇
  1986年   109417篇
  1985年   106503篇
  1984年   85007篇
  1983年   74722篇
  1982年   53922篇
  1981年   49850篇
  1980年   46698篇
  1979年   75532篇
  1978年   58302篇
  1977年   50811篇
  1976年   47492篇
  1975年   49176篇
  1974年   55631篇
  1973年   53215篇
  1972年   50043篇
  1971年   46739篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
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