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   3787548篇
  免费   302606篇
  国内免费   14751篇
耳鼻咽喉   50840篇
儿科学   119592篇
妇产科学   97854篇
基础医学   591845篇
口腔科学   103051篇
临床医学   340720篇
内科学   676162篇
皮肤病学   98707篇
神经病学   317768篇
特种医学   147024篇
外国民族医学   262篇
外科学   582699篇
综合类   113998篇
现状与发展   23篇
一般理论   2362篇
预防医学   311652篇
眼科学   89219篇
药学   261454篇
  26篇
中国医学   11470篇
肿瘤学   188177篇
  2021年   55943篇
  2020年   35580篇
  2019年   58761篇
  2018年   73071篇
  2017年   55718篇
  2016年   61594篇
  2015年   75397篇
  2014年   109742篇
  2013年   175223篇
  2012年   105567篇
  2011年   107480篇
  2010年   121218篇
  2009年   124079篇
  2008年   93847篇
  2007年   98519篇
  2006年   107838篇
  2005年   102562篇
  2004年   104120篇
  2003年   93933篇
  2002年   83277篇
  2001年   136105篇
  2000年   129655篇
  1999年   122023篇
  1998年   68647篇
  1997年   65310篇
  1996年   63017篇
  1995年   58564篇
  1994年   52553篇
  1993年   48908篇
  1992年   85061篇
  1991年   80973篇
  1990年   76679篇
  1989年   75115篇
  1988年   69023篇
  1987年   67207篇
  1986年   63548篇
  1985年   62765篇
  1984年   54883篇
  1983年   49585篇
  1982年   43634篇
  1981年   40993篇
  1980年   38461篇
  1979年   44846篇
  1978年   38238篇
  1977年   34919篇
  1976年   31967篇
  1975年   30782篇
  1974年   32478篇
  1973年   31181篇
  1972年   29038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