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   3160488篇
  免费   262285篇
  国内免费   13788篇
耳鼻咽喉   43686篇
儿科学   99911篇
妇产科学   81426篇
基础医学   507570篇
口腔科学   84223篇
临床医学   278486篇
内科学   556323篇
皮肤病学   85738篇
神经病学   272637篇
特种医学   125396篇
外国民族医学   370篇
外科学   496914篇
综合类   96720篇
现状与发展   23篇
一般理论   2168篇
预防医学   263928篇
眼科学   71131篇
药学   214347篇
  22篇
中国医学   9194篇
肿瘤学   146348篇
  2021年   54622篇
  2020年   34849篇
  2019年   57798篇
  2018年   70212篇
  2017年   53548篇
  2016年   59075篇
  2015年   73426篇
  2014年   107416篇
  2013年   172465篇
  2012年   84046篇
  2011年   83016篇
  2010年   114179篇
  2009年   119471篇
  2008年   70916篇
  2007年   72931篇
  2006年   83997篇
  2005年   79986篇
  2004年   81924篇
  2003年   73330篇
  2002年   63406篇
  2001年   89269篇
  2000年   81839篇
  1999年   84985篇
  1998年   63426篇
  1997年   61785篇
  1996年   59490篇
  1995年   54937篇
  1994年   49132篇
  1993年   45923篇
  1992年   58567篇
  1991年   55261篇
  1990年   52435篇
  1989年   51835篇
  1988年   48377篇
  1987年   47274篇
  1986年   45330篇
  1985年   45527篇
  1984年   43119篇
  1983年   39946篇
  1982年   39852篇
  1981年   37600篇
  1980年   35558篇
  1979年   35114篇
  1978年   32170篇
  1977年   29715篇
  1976年   27289篇
  1975年   25806篇
  1974年   26299篇
  1973年   25138篇
  1972年   23676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