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   4358534篇
  免费   339873篇
  国内免费   14722篇
耳鼻咽喉   60309篇
儿科学   139482篇
妇产科学   114297篇
基础医学   666826篇
口腔科学   118087篇
临床医学   397290篇
内科学   790598篇
皮肤病学   107744篇
神经病学   368494篇
特种医学   169538篇
外国民族医学   754篇
外科学   656195篇
综合类   121325篇
现状与发展   24篇
一般理论   2618篇
预防医学   360494篇
眼科学   100949篇
药学   307627篇
  26篇
中国医学   11953篇
肿瘤学   218499篇
  2021年   56165篇
  2020年   35818篇
  2019年   58800篇
  2018年   74374篇
  2017年   57001篇
  2016年   63098篇
  2015年   76066篇
  2014年   110271篇
  2013年   175807篇
  2012年   124297篇
  2011年   129069篇
  2010年   125885篇
  2009年   127603篇
  2008年   115278篇
  2007年   122531篇
  2006年   131312篇
  2005年   125429篇
  2004年   126723篇
  2003年   116938篇
  2002年   106180篇
  2001年   166999篇
  2000年   162079篇
  1999年   148716篇
  1998年   71688篇
  1997年   67616篇
  1996年   65646篇
  1995年   61058篇
  1994年   54984篇
  1993年   51028篇
  1992年   106668篇
  1991年   101435篇
  1990年   97284篇
  1989年   94855篇
  1988年   87201篇
  1987年   85342篇
  1986年   80236篇
  1985年   78387篇
  1984年   65426篇
  1983年   58214篇
  1982年   47195篇
  1981年   43866篇
  1980年   41079篇
  1979年   55124篇
  1978年   44765篇
  1977年   39993篇
  1976年   36847篇
  1975年   36815篇
  1974年   39621篇
  1973年   37766篇
  1972年   35367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