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   4389116篇
  免费   341885篇
  国内免费   14807篇
耳鼻咽喉   60540篇
儿科学   140399篇
妇产科学   114902篇
基础医学   670764篇
口腔科学   118432篇
临床医学   400764篇
内科学   796939篇
皮肤病学   108493篇
神经病学   371364篇
特种医学   170471篇
外国民族医学   755篇
外科学   660737篇
综合类   121645篇
现状与发展   24篇
一般理论   2672篇
预防医学   363165篇
眼科学   101440篇
药学   309643篇
  26篇
中国医学   11987篇
肿瘤学   220646篇
  2021年   56439篇
  2020年   36092篇
  2019年   59280篇
  2018年   74999篇
  2017年   57521篇
  2016年   63636篇
  2015年   76711篇
  2014年   111007篇
  2013年   176810篇
  2012年   126485篇
  2011年   131501篇
  2010年   127007篇
  2009年   128548篇
  2008年   117560篇
  2007年   124995篇
  2006年   133737篇
  2005年   127909篇
  2004年   129147篇
  2003年   119337篇
  2002年   108662篇
  2001年   167215篇
  2000年   162267篇
  1999年   148923篇
  1998年   71906篇
  1997年   67844篇
  1996年   65833篇
  1995年   61260篇
  1994年   55137篇
  1993年   51149篇
  1992年   106792篇
  1991年   101557篇
  1990年   97366篇
  1989年   94933篇
  1988年   87276篇
  1987年   85451篇
  1986年   80302篇
  1985年   78465篇
  1984年   65508篇
  1983年   58286篇
  1982年   47293篇
  1981年   43947篇
  1980年   41151篇
  1979年   55197篇
  1978年   44838篇
  1977年   40065篇
  1976年   36893篇
  1975年   36853篇
  1974年   39684篇
  1973年   37818篇
  1972年   35417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.
69.

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   
70.
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   

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