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   4360727篇
  免费   339812篇
  国内免费   14738篇
耳鼻咽喉   60331篇
儿科学   139503篇
妇产科学   114286篇
基础医学   667311篇
口腔科学   118057篇
临床医学   397296篇
内科学   791186篇
皮肤病学   107857篇
神经病学   368672篇
特种医学   169585篇
外国民族医学   753篇
外科学   656404篇
综合类   121291篇
现状与发展   24篇
一般理论   2617篇
预防医学   360562篇
眼科学   101000篇
药学   307837篇
  26篇
中国医学   11941篇
肿瘤学   218738篇
  2021年   56206篇
  2020年   35830篇
  2019年   58839篇
  2018年   74395篇
  2017年   57014篇
  2016年   63139篇
  2015年   76112篇
  2014年   110335篇
  2013年   175879篇
  2012年   124461篇
  2011年   129272篇
  2010年   125985篇
  2009年   127710篇
  2008年   115443篇
  2007年   122754篇
  2006年   131513篇
  2005年   125631篇
  2004年   126886篇
  2003年   117091篇
  2002年   106312篇
  2001年   166997篇
  2000年   162063篇
  1999年   148707篇
  1998年   71705篇
  1997年   67645篇
  1996年   65654篇
  1995年   61068篇
  1994年   54991篇
  1993年   51027篇
  1992年   106661篇
  1991年   101426篇
  1990年   97289篇
  1989年   94851篇
  1988年   87177篇
  1987年   85353篇
  1986年   80235篇
  1985年   78390篇
  1984年   65417篇
  1983年   58221篇
  1982年   47199篇
  1981年   43865篇
  1980年   41081篇
  1979年   55122篇
  1978年   44766篇
  1977年   39983篇
  1976年   36841篇
  1975年   36812篇
  1974年   39618篇
  1973年   37758篇
  1972年   35365篇
排序方式: 共有10000条查询结果,搜索用时 31 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