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   4234896篇
  免费   337200篇
  国内免费   14812篇
耳鼻咽喉   60622篇
儿科学   138595篇
妇产科学   112784篇
基础医学   647134篇
口腔科学   115166篇
临床医学   379765篇
内科学   766591篇
皮肤病学   105025篇
神经病学   351586篇
特种医学   168196篇
外国民族医学   1003篇
外科学   652175篇
综合类   121154篇
现状与发展   23篇
一般理论   2488篇
预防医学   353016篇
眼科学   98960篇
药学   298215篇
  24篇
中国医学   11328篇
肿瘤学   203058篇
  2021年   56093篇
  2020年   35715篇
  2019年   59000篇
  2018年   73921篇
  2017年   56369篇
  2016年   62264篇
  2015年   75877篇
  2014年   110402篇
  2013年   176160篇
  2012年   113702篇
  2011年   117767篇
  2010年   123703篇
  2009年   126072篇
  2008年   105328篇
  2007年   112500篇
  2006年   121563篇
  2005年   117172篇
  2004年   118536篇
  2003年   109123篇
  2002年   99430篇
  2001年   148599篇
  2000年   143895篇
  1999年   135223篇
  1998年   70811篇
  1997年   66833篇
  1996年   64933篇
  1995年   60185篇
  1994年   54599篇
  1993年   50604篇
  1992年   99453篇
  1991年   96347篇
  1990年   92926篇
  1989年   90636篇
  1988年   84355篇
  1987年   82581篇
  1986年   78092篇
  1985年   76962篇
  1984年   65122篇
  1983年   58280篇
  1982年   47388篇
  1981年   44209篇
  1980年   41501篇
  1979年   56370篇
  1978年   45721篇
  1977年   40967篇
  1976年   38048篇
  1975年   38473篇
  1974年   41659篇
  1973年   40163篇
  1972年   37665篇
排序方式: 共有10000条查询结果,搜索用时 10 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