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   4690315篇
  免费   360771篇
  国内免费   14855篇
耳鼻咽喉   65707篇
儿科学   151528篇
妇产科学   124076篇
基础医学   711487篇
口腔科学   128891篇
临床医学   427418篇
内科学   848416篇
皮肤病学   114918篇
神经病学   386457篇
特种医学   182186篇
外国民族医学   780篇
外科学   713061篇
综合类   133165篇
现状与发展   23篇
一般理论   2768篇
预防医学   393052篇
眼科学   111101篇
药学   329429篇
  27篇
中国医学   12310篇
肿瘤学   229141篇
  2021年   56296篇
  2019年   58855篇
  2018年   75087篇
  2017年   57546篇
  2016年   63835篇
  2015年   76337篇
  2014年   110868篇
  2013年   176301篇
  2012年   133929篇
  2011年   141891篇
  2010年   129469篇
  2009年   129327篇
  2008年   127725篇
  2007年   137011篇
  2006年   144915篇
  2005年   139880篇
  2004年   140008篇
  2003年   130026篇
  2002年   119065篇
  2001年   173733篇
  2000年   169631篇
  1999年   154640篇
  1998年   73139篇
  1997年   68407篇
  1996年   66603篇
  1995年   61888篇
  1994年   56062篇
  1993年   51927篇
  1992年   113012篇
  1991年   109586篇
  1990年   105785篇
  1989年   102947篇
  1988年   94814篇
  1987年   93420篇
  1986年   87996篇
  1985年   86434篇
  1984年   71244篇
  1983年   63207篇
  1982年   49407篇
  1981年   46076篇
  1980年   43188篇
  1979年   62776篇
  1978年   50412篇
  1977年   44112篇
  1976年   41343篇
  1975年   41935篇
  1974年   46788篇
  1973年   44860篇
  1972年   41961篇
  1971年   39202篇
排序方式: 共有10000条查询结果,搜索用时 0 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