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   4391709篇
  免费   351082篇
  国内免费   14358篇
耳鼻咽喉   60765篇
儿科学   141215篇
妇产科学   117274篇
基础医学   670029篇
口腔科学   123732篇
临床医学   400058篇
内科学   791996篇
皮肤病学   107982篇
神经病学   368403篇
特种医学   173344篇
外国民族医学   733篇
外科学   663555篇
综合类   129382篇
现状与发展   24篇
一般理论   2695篇
预防医学   370559篇
眼科学   102589篇
药学   309475篇
  27篇
中国医学   11280篇
肿瘤学   212032篇
  2021年   55715篇
  2019年   58412篇
  2018年   73470篇
  2017年   56160篇
  2016年   62079篇
  2015年   75427篇
  2014年   109726篇
  2013年   175040篇
  2012年   118865篇
  2011年   123510篇
  2010年   124205篇
  2009年   126350篇
  2008年   110464篇
  2007年   117212篇
  2006年   126013篇
  2005年   121185篇
  2004年   122924篇
  2003年   112794篇
  2002年   102367篇
  2001年   154558篇
  2000年   150141篇
  1999年   139823篇
  1998年   70667篇
  1997年   67157篇
  1996年   65458篇
  1995年   60906篇
  1994年   55088篇
  1993年   51340篇
  1992年   105245篇
  1991年   101535篇
  1990年   97654篇
  1989年   95447篇
  1988年   88706篇
  1987年   87095篇
  1986年   83201篇
  1985年   81720篇
  1984年   68552篇
  1983年   61555篇
  1982年   48977篇
  1981年   45619篇
  1980年   42990篇
  1979年   61418篇
  1978年   49398篇
  1977年   43495篇
  1976年   40523篇
  1975年   40378篇
  1974年   45290篇
  1973年   43868篇
  1972年   41041篇
  1971年   38222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