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   4997552篇
  免费   389006篇
  国内免费   17444篇
耳鼻咽喉   70482篇
儿科学   163526篇
妇产科学   134603篇
基础医学   746948篇
口腔科学   140280篇
临床医学   459317篇
内科学   907684篇
皮肤病学   117920篇
神经病学   414939篇
特种医学   196392篇
外国民族医学   1314篇
外科学   748634篇
综合类   146602篇
现状与发展   23篇
一般理论   2833篇
预防医学   423514篇
眼科学   118347篇
药学   355032篇
  27篇
中国医学   13355篇
肿瘤学   242230篇
  2021年   56910篇
  2019年   59372篇
  2018年   76147篇
  2017年   58238篇
  2016年   64504篇
  2015年   77194篇
  2014年   111859篇
  2013年   177854篇
  2012年   139396篇
  2011年   147738篇
  2010年   131467篇
  2009年   131019篇
  2008年   133244篇
  2007年   142728篇
  2006年   150466篇
  2005年   145265篇
  2004年   146041篇
  2003年   135383篇
  2002年   124827篇
  2001年   187559篇
  2000年   185432篇
  1999年   168034篇
  1998年   75588篇
  1997年   70502篇
  1996年   68475篇
  1995年   64051篇
  1994年   58256篇
  1993年   54127篇
  1992年   127374篇
  1991年   123785篇
  1990年   119450篇
  1989年   115637篇
  1988年   107409篇
  1987年   105629篇
  1986年   100301篇
  1985年   98192篇
  1984年   79934篇
  1983年   70586篇
  1982年   52640篇
  1981年   48917篇
  1980年   45795篇
  1979年   71866篇
  1978年   55749篇
  1977年   48650篇
  1976年   45835篇
  1975年   46333篇
  1974年   52793篇
  1973年   51066篇
  1972年   47581篇
  1971年   44229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.
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