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   4932534篇
  免费   373977篇
  国内免费   15273篇
耳鼻咽喉   68815篇
儿科学   158462篇
妇产科学   131977篇
基础医学   739637篇
口腔科学   136994篇
临床医学   455062篇
内科学   897760篇
皮肤病学   118365篇
神经病学   411232篇
特种医学   191434篇
外国民族医学   980篇
外科学   734879篇
综合类   136228篇
现状与发展   25篇
一般理论   2907篇
预防医学   412464篇
眼科学   115733篇
药学   349794篇
  29篇
中国医学   12849篇
肿瘤学   246158篇
  2021年   56676篇
  2019年   59136篇
  2018年   75895篇
  2017年   58245篇
  2016年   64419篇
  2015年   76946篇
  2014年   111284篇
  2013年   176935篇
  2012年   140824篇
  2011年   148925篇
  2010年   130858篇
  2009年   130845篇
  2008年   134837篇
  2007年   144722篇
  2006年   151801篇
  2005年   146188篇
  2004年   146812篇
  2003年   136452篇
  2002年   125556篇
  2001年   191546篇
  2000年   187758篇
  1999年   169395篇
  1998年   74580篇
  1997年   69665篇
  1996年   67936篇
  1995年   63263篇
  1994年   57324篇
  1993年   53106篇
  1992年   124840篇
  1991年   120096篇
  1990年   115675篇
  1989年   112442篇
  1988年   103924篇
  1987年   101860篇
  1986年   96280篇
  1985年   93518篇
  1984年   76352篇
  1983年   67405篇
  1982年   51081篇
  1981年   47261篇
  1980年   44351篇
  1979年   66852篇
  1978年   52776篇
  1977年   46456篇
  1976年   42970篇
  1975年   43953篇
  1974年   49078篇
  1973年   47320篇
  1972年   44533篇
  1971年   41292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.
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