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   3300392篇
  免费   269664篇
  国内免费   13675篇
耳鼻咽喉   45331篇
儿科学   98601篇
妇产科学   82192篇
基础医学   526978篇
口腔科学   90051篇
临床医学   294674篇
内科学   579004篇
皮肤病学   88047篇
神经病学   282749篇
特种医学   129040篇
外国民族医学   109篇
外科学   520680篇
综合类   97340篇
现状与发展   23篇
一般理论   2264篇
预防医学   271401篇
眼科学   75505篇
药学   229238篇
  24篇
中国医学   9691篇
肿瘤学   160789篇
  2021年   55126篇
  2020年   35143篇
  2019年   58255篇
  2018年   71026篇
  2017年   54113篇
  2016年   59684篇
  2015年   74119篇
  2014年   108446篇
  2013年   173810篇
  2012年   89154篇
  2011年   88145篇
  2010年   115961篇
  2009年   120740篇
  2008年   76237篇
  2007年   78503篇
  2006年   89799篇
  2005年   85376篇
  2004年   87142篇
  2003年   78338篇
  2002年   68194篇
  2001年   102923篇
  2000年   95844篇
  1999年   95877篇
  1998年   64819篇
  1997年   62662篇
  1996年   60389篇
  1995年   55800篇
  1994年   49774篇
  1993年   46519篇
  1992年   66451篇
  1991年   62783篇
  1990年   59330篇
  1989年   58883篇
  1988年   54307篇
  1987年   53024篇
  1986年   49943篇
  1985年   50402篇
  1984年   46080篇
  1983年   42464篇
  1982年   40675篇
  1981年   38343篇
  1980年   36048篇
  1979年   36972篇
  1978年   33132篇
  1977年   30896篇
  1976年   27671篇
  1975年   26244篇
  1974年   26621篇
  1973年   25274篇
  1972年   23769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