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   3508533篇
  免费   284562篇
  国内免费   16247篇
耳鼻咽喉   48665篇
儿科学   107212篇
妇产科学   91551篇
基础医学   549592篇
口腔科学   97229篇
临床医学   311114篇
内科学   621562篇
皮肤病学   93261篇
神经病学   299090篇
特种医学   139461篇
外国民族医学   468篇
外科学   545532篇
综合类   110223篇
现状与发展   30篇
一般理论   2264篇
预防医学   285543篇
眼科学   80135篇
药学   245174篇
  36篇
中国医学   11308篇
肿瘤学   169892篇
  2021年   55835篇
  2020年   35777篇
  2019年   58609篇
  2018年   71522篇
  2017年   54677篇
  2016年   60398篇
  2015年   74829篇
  2014年   109279篇
  2013年   174240篇
  2012年   91677篇
  2011年   90789篇
  2010年   116426篇
  2009年   121449篇
  2008年   78240篇
  2007年   81721篇
  2006年   92577篇
  2005年   87998篇
  2004年   89704篇
  2003年   81034篇
  2002年   71287篇
  2001年   109703篇
  2000年   102935篇
  1999年   101856篇
  1998年   65545篇
  1997年   63448篇
  1996年   60902篇
  1995年   56322篇
  1994年   50513篇
  1993年   47168篇
  1992年   71930篇
  1991年   68195篇
  1990年   65189篇
  1989年   64527篇
  1988年   60372篇
  1987年   58953篇
  1986年   56431篇
  1985年   56081篇
  1984年   50522篇
  1983年   45814篇
  1982年   42336篇
  1981年   39809篇
  1980年   37634篇
  1979年   42949篇
  1978年   37361篇
  1977年   34275篇
  1976年   31038篇
  1975年   30694篇
  1974年   32415篇
  1973年   31088篇
  1972年   29517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.

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