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   4271126篇
  免费   343286篇
  国内免费   14468篇
耳鼻咽喉   60244篇
儿科学   136353篇
妇产科学   111074篇
基础医学   652765篇
口腔科学   114246篇
临床医学   393007篇
内科学   773559篇
皮肤病学   110080篇
神经病学   356169篇
特种医学   165760篇
外国民族医学   503篇
外科学   662450篇
综合类   119341篇
现状与发展   91篇
一般理论   2564篇
预防医学   354883篇
眼科学   100522篇
药学   295070篇
  26篇
中国医学   11317篇
肿瘤学   208856篇
  2021年   56708篇
  2020年   37799篇
  2019年   59072篇
  2018年   76663篇
  2017年   59322篇
  2016年   65660篇
  2015年   78607篇
  2014年   115615篇
  2013年   180605篇
  2012年   122683篇
  2011年   128238篇
  2010年   129468篇
  2009年   132107篇
  2008年   114607篇
  2007年   121275篇
  2006年   130851篇
  2005年   125212篇
  2004年   125077篇
  2003年   115233篇
  2002年   104486篇
  2001年   150923篇
  2000年   145414篇
  1999年   135276篇
  1998年   71461篇
  1997年   67375篇
  1996年   65264篇
  1995年   60472篇
  1994年   54263篇
  1993年   50379篇
  1992年   96348篇
  1991年   93059篇
  1990年   89358篇
  1989年   87151篇
  1988年   80298篇
  1987年   78765篇
  1986年   74109篇
  1985年   73173篇
  1984年   61770篇
  1983年   55520篇
  1982年   46108篇
  1981年   43172篇
  1980年   40565篇
  1979年   53153篇
  1978年   44075篇
  1977年   38947篇
  1976年   36324篇
  1975年   36309篇
  1974年   39446篇
  1973年   37665篇
  1972年   35281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