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   3169322篇
  免费   262632篇
  国内免费   13809篇
耳鼻咽喉   43779篇
儿科学   100026篇
妇产科学   81674篇
基础医学   508936篇
口腔科学   84501篇
临床医学   279432篇
内科学   557882篇
皮肤病学   85877篇
神经病学   273357篇
特种医学   125689篇
外国民族医学   361篇
外科学   498303篇
综合类   96792篇
现状与发展   23篇
一般理论   2169篇
预防医学   264355篇
眼科学   71494篇
药学   215052篇
  22篇
中国医学   9229篇
肿瘤学   146810篇
  2021年   54682篇
  2020年   34897篇
  2019年   57881篇
  2018年   70314篇
  2017年   53648篇
  2016年   59223篇
  2015年   73524篇
  2014年   107575篇
  2013年   172678篇
  2012年   84657篇
  2011年   83707篇
  2010年   114466篇
  2009年   119731篇
  2008年   71617篇
  2007年   73683篇
  2006年   84767篇
  2005年   80762篇
  2004年   82562篇
  2003年   73979篇
  2002年   64067篇
  2001年   89276篇
  2000年   81847篇
  1999年   84999篇
  1998年   63475篇
  1997年   61815篇
  1996年   59528篇
  1995年   54981篇
  1994年   49171篇
  1993年   45951篇
  1992年   58581篇
  1991年   55259篇
  1990年   52425篇
  1989年   51813篇
  1988年   48365篇
  1987年   47278篇
  1986年   45332篇
  1985年   45518篇
  1984年   43122篇
  1983年   39938篇
  1982年   39866篇
  1981年   37624篇
  1980年   35578篇
  1979年   35106篇
  1978年   32173篇
  1977年   29721篇
  1976年   27305篇
  1975年   25801篇
  1974年   26298篇
  1973年   25145篇
  1972年   23672篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
65.
66.
67.
68.

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   
69.
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   

70.
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