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   3713754篇
  免费   308641篇
  国内免费   16063篇
耳鼻咽喉   51209篇
儿科学   113896篇
妇产科学   95029篇
基础医学   582720篇
口腔科学   101712篇
临床医学   333175篇
内科学   665093篇
皮肤病学   93880篇
神经病学   315166篇
特种医学   147277篇
外国民族医学   378篇
外科学   575859篇
综合类   114100篇
现状与发展   25篇
一般理论   2321篇
预防医学   305369篇
眼科学   85816篇
药学   260781篇
  25篇
中国医学   11358篇
肿瘤学   183269篇
  2021年   55440篇
  2020年   35299篇
  2019年   58330篇
  2018年   72041篇
  2017年   54933篇
  2016年   60692篇
  2015年   74799篇
  2014年   109166篇
  2013年   174202篇
  2012年   98471篇
  2011年   98982篇
  2010年   118345篇
  2009年   122279篇
  2008年   85900篇
  2007年   90104篇
  2006年   100045篇
  2005年   95188篇
  2004年   96847篇
  2003年   87784篇
  2002年   76817篇
  2001年   133043篇
  2000年   127243篇
  1999年   120759篇
  1998年   68717篇
  1997年   65498篇
  1996年   63238篇
  1995年   58859篇
  1994年   52810篇
  1993年   49326篇
  1992年   86418篇
  1991年   82161篇
  1990年   78106篇
  1989年   76660篇
  1988年   70749篇
  1987年   69061篇
  1986年   65105篇
  1985年   64620篇
  1984年   56002篇
  1983年   50233篇
  1982年   44306篇
  1981年   41330篇
  1980年   38919篇
  1979年   46349篇
  1978年   39231篇
  1977年   35514篇
  1976年   32231篇
  1975年   31248篇
  1974年   32879篇
  1973年   31495篇
  1972年   29406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