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   3186563篇
  免费   272291篇
  国内免费   17919篇
耳鼻咽喉   44089篇
儿科学   96856篇
妇产科学   81448篇
基础医学   509755篇
口腔科学   86881篇
临床医学   286373篇
内科学   549508篇
皮肤病学   85237篇
神经病学   273979篇
特种医学   127083篇
外国民族医学   232篇
外科学   497792篇
综合类   111429篇
现状与发展   37篇
一般理论   2180篇
预防医学   268591篇
眼科学   72652篇
药学   221680篇
  75篇
中国医学   13171篇
肿瘤学   147725篇
  2021年   57190篇
  2020年   37014篇
  2019年   59277篇
  2018年   71654篇
  2017年   55024篇
  2016年   60351篇
  2015年   75786篇
  2014年   110546篇
  2013年   175179篇
  2012年   87432篇
  2011年   85586篇
  2010年   116464篇
  2009年   121415篇
  2008年   71171篇
  2007年   73020篇
  2006年   84156篇
  2005年   79674篇
  2004年   81198篇
  2003年   72323篇
  2002年   61748篇
  2001年   84844篇
  2000年   77018篇
  1999年   80753篇
  1998年   63512篇
  1997年   61932篇
  1996年   59613篇
  1995年   55154篇
  1994年   49404篇
  1993年   46173篇
  1992年   57591篇
  1991年   54847篇
  1990年   51979篇
  1989年   51510篇
  1988年   48297篇
  1987年   47189篇
  1986年   44958篇
  1985年   45524篇
  1984年   43576篇
  1983年   40232篇
  1982年   40265篇
  1981年   38118篇
  1980年   36034篇
  1979年   36891篇
  1978年   33508篇
  1977年   30830篇
  1976年   28037篇
  1975年   26560篇
  1974年   27677篇
  1973年   26596篇
  1972年   25036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