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   3477372篇
  免费   284743篇
  国内免费   14030篇
耳鼻咽喉   48489篇
儿科学   111319篇
妇产科学   90937篇
基础医学   549955篇
口腔科学   93664篇
临床医学   308418篇
内科学   617039篇
皮肤病学   91612篇
神经病学   295062篇
特种医学   137408篇
外国民族医学   392篇
外科学   543430篇
综合类   102769篇
现状与发展   23篇
一般理论   2214篇
预防医学   289552篇
眼科学   79386篇
药学   240837篇
  23篇
中国医学   9854篇
肿瘤学   163762篇
  2021年   55361篇
  2020年   35356篇
  2019年   58548篇
  2018年   71812篇
  2017年   54644篇
  2016年   60304篇
  2015年   74637篇
  2014年   109085篇
  2013年   174651篇
  2012年   91987篇
  2011年   92326篇
  2010年   117379篇
  2009年   121903篇
  2008年   80214篇
  2007年   83797篇
  2006年   94474篇
  2005年   90398篇
  2004年   91972篇
  2003年   83351篇
  2002年   73793篇
  2001年   104647篇
  2000年   97358篇
  1999年   97640篇
  1998年   65557篇
  1997年   63216篇
  1996年   61114篇
  1995年   56545篇
  1994年   50811篇
  1993年   47271篇
  1992年   69736篇
  1991年   66952篇
  1990年   64336篇
  1989年   63461篇
  1988年   59438篇
  1987年   57861篇
  1986年   55228篇
  1985年   55175篇
  1984年   49759篇
  1983年   45798篇
  1982年   42254篇
  1981年   39734篇
  1980年   37436篇
  1979年   41862篇
  1978年   36500篇
  1977年   33465篇
  1976年   30813篇
  1975年   30058篇
  1974年   31282篇
  1973年   30084篇
  1972年   28352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