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   3502347篇
  免费   285387篇
  国内免费   13472篇
耳鼻咽喉   47638篇
儿科学   110728篇
妇产科学   90624篇
基础医学   555313篇
口腔科学   94367篇
临床医学   319577篇
内科学   619182篇
皮肤病学   92060篇
神经病学   299073篇
特种医学   136471篇
外国民族医学   288篇
外科学   534113篇
综合类   103329篇
现状与发展   24篇
一般理论   2487篇
预防医学   300681篇
眼科学   79709篇
药学   239919篇
  28篇
中国医学   9448篇
肿瘤学   166147篇
  2021年   55391篇
  2020年   35278篇
  2019年   58287篇
  2018年   71914篇
  2017年   54835篇
  2016年   60305篇
  2015年   74345篇
  2014年   108581篇
  2013年   174025篇
  2012年   99365篇
  2011年   100793篇
  2010年   118614篇
  2009年   122318篇
  2008年   87342篇
  2007年   91504篇
  2006年   100895篇
  2005年   96755篇
  2004年   98160篇
  2003年   88593篇
  2002年   78333篇
  2001年   102893篇
  2000年   95528篇
  1999年   95577篇
  1998年   64809篇
  1997年   62769篇
  1996年   60926篇
  1995年   56304篇
  1994年   50562篇
  1993年   47219篇
  1992年   67774篇
  1991年   65014篇
  1990年   61671篇
  1989年   60793篇
  1988年   56586篇
  1987年   55382篇
  1986年   52793篇
  1985年   52414篇
  1984年   48308篇
  1983年   44441篇
  1982年   41824篇
  1981年   39535篇
  1980年   37252篇
  1979年   40827篇
  1978年   36359篇
  1977年   32918篇
  1976年   30198篇
  1975年   29101篇
  1974年   30609篇
  1973年   29709篇
  1972年   27951篇
排序方式: 共有10000条查询结果,搜索用时 8 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