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   2524573篇
  免费   222799篇
  国内免费   12709篇
耳鼻咽喉   34379篇
儿科学   79371篇
妇产科学   62764篇
基础医学   426674篇
口腔科学   66527篇
临床医学   224790篇
内科学   423330篇
皮肤病学   75452篇
神经病学   224264篇
特种医学   99287篇
外国民族医学   29篇
外科学   399518篇
综合类   81923篇
现状与发展   23篇
一般理论   2007篇
预防医学   217347篇
眼科学   56278篇
药学   168067篇
  22篇
中国医学   7814篇
肿瘤学   110215篇
  2022年   22670篇
  2021年   54340篇
  2020年   34655篇
  2019年   57515篇
  2018年   68859篇
  2017年   52357篇
  2016年   57616篇
  2015年   72553篇
  2014年   106732篇
  2013年   171881篇
  2012年   66528篇
  2011年   62125篇
  2010年   109315篇
  2009年   116088篇
  2008年   49888篇
  2007年   49194篇
  2006年   61650篇
  2005年   57448篇
  2004年   60020篇
  2003年   51543篇
  2002年   41757篇
  2001年   52713篇
  2000年   43698篇
  1999年   54151篇
  1998年   59867篇
  1997年   59161篇
  1996年   56757篇
  1995年   52395篇
  1994年   46539篇
  1993年   43637篇
  1992年   34719篇
  1991年   32309篇
  1990年   29725篇
  1989年   30292篇
  1988年   28328篇
  1987年   27577篇
  1986年   26274篇
  1985年   27752篇
  1984年   30817篇
  1983年   29757篇
  1982年   35624篇
  1981年   34148篇
  1980年   32276篇
  1979年   23035篇
  1978年   24469篇
  1977年   23572篇
  1976年   21320篇
  1975年   18846篇
  1974年   17357篇
  1973年   16590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.
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