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   3759659篇
  免费   322938篇
  国内免费   14366篇
耳鼻咽喉   52391篇
儿科学   119882篇
妇产科学   97904篇
基础医学   581757篇
口腔科学   103489篇
临床医学   342307篇
内科学   674492篇
皮肤病学   99157篇
神经病学   322831篇
特种医学   150582篇
外国民族医学   497篇
外科学   587527篇
综合类   113831篇
现状与发展   91篇
一般理论   2375篇
预防医学   311339篇
眼科学   87474篇
药学   259910篇
  22篇
中国医学   10130篇
肿瘤学   178975篇
  2021年   56024篇
  2020年   37383篇
  2019年   58634篇
  2018年   74419篇
  2017年   57505篇
  2016年   63589篇
  2015年   77483篇
  2014年   114391篇
  2013年   179327篇
  2012年   99123篇
  2011年   99540篇
  2010年   121910篇
  2009年   127582篇
  2008年   87353篇
  2007年   89924篇
  2006年   101709篇
  2005年   95970篇
  2004年   98167篇
  2003年   88406篇
  2002年   78226篇
  2001年   122051篇
  2000年   115987篇
  1999年   112637篇
  1998年   68414篇
  1997年   65731篇
  1996年   63403篇
  1995年   58949篇
  1994年   52819篇
  1993年   49211篇
  1992年   83218篇
  1991年   79797篇
  1990年   76233篇
  1989年   74925篇
  1988年   69696篇
  1987年   68370篇
  1986年   65167篇
  1985年   64964篇
  1984年   56677篇
  1983年   51357篇
  1982年   44825篇
  1981年   41953篇
  1980年   39554篇
  1979年   48989篇
  1978年   40985篇
  1977年   36813篇
  1976年   34101篇
  1975年   32855篇
  1974年   35557篇
  1973年   34212篇
  1972年   31715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.

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