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   4311922篇
  免费   340388篇
  国内免费   15700篇
耳鼻咽喉   59962篇
儿科学   135145篇
妇产科学   115617篇
基础医学   655944篇
口腔科学   119915篇
临床医学   385617篇
内科学   783176篇
皮肤病学   108074篇
神经病学   363102篇
特种医学   169540篇
外国民族医学   897篇
外科学   657994篇
综合类   128039篇
现状与发展   24篇
一般理论   2557篇
预防医学   352540篇
眼科学   100275篇
药学   303571篇
  23篇
中国医学   12272篇
肿瘤学   213726篇
  2021年   55899篇
  2020年   35585篇
  2019年   58738篇
  2018年   73462篇
  2017年   56329篇
  2016年   62454篇
  2015年   75720篇
  2014年   110151篇
  2013年   175571篇
  2012年   117713篇
  2011年   120975篇
  2010年   123297篇
  2009年   126286篇
  2008年   108048篇
  2007年   114980篇
  2006年   124204篇
  2005年   119195篇
  2004年   120346篇
  2003年   110668篇
  2002年   100432篇
  2001年   159353篇
  2000年   154608篇
  1999年   142634篇
  1998年   71122篇
  1997年   67497篇
  1996年   65093篇
  1995年   60467篇
  1994年   54493篇
  1993年   50652篇
  1992年   102797篇
  1991年   97824篇
  1990年   93567篇
  1989年   91486篇
  1988年   84925篇
  1987年   82947篇
  1986年   79038篇
  1985年   77204篇
  1984年   65453篇
  1983年   58119篇
  1982年   47577篇
  1981年   44123篇
  1980年   41626篇
  1979年   56728篇
  1978年   46267篇
  1977年   41255篇
  1976年   37763篇
  1975年   38054篇
  1974年   41733篇
  1973年   40357篇
  1972年   38198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