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   3327356篇
  免费   269882篇
  国内免费   13528篇
耳鼻咽喉   45049篇
儿科学   103223篇
妇产科学   84486篇
基础医学   531495篇
口腔科学   89396篇
临床医学   299586篇
内科学   579108篇
皮肤病学   90769篇
神经病学   282404篇
特种医学   131534篇
外国民族医学   225篇
外科学   513990篇
综合类   100487篇
现状与发展   23篇
一般理论   2213篇
预防医学   275510篇
眼科学   76221篇
药学   233718篇
  27篇
中国医学   9977篇
肿瘤学   161325篇
  2021年   55219篇
  2020年   35172篇
  2019年   58095篇
  2018年   71122篇
  2017年   54211篇
  2016年   59947篇
  2015年   74139篇
  2014年   108390篇
  2013年   173607篇
  2012年   89716篇
  2011年   89137篇
  2010年   116100篇
  2009年   120719篇
  2008年   75618篇
  2007年   78270篇
  2006年   89165篇
  2005年   83993篇
  2004年   85731篇
  2003年   76708篇
  2002年   66291篇
  2001年   107155篇
  2000年   99997篇
  1999年   98916篇
  1998年   65036篇
  1997年   62852篇
  1996年   60612篇
  1995年   56175篇
  1994年   50066篇
  1993年   46817篇
  1992年   68059篇
  1991年   64406篇
  1990年   61454篇
  1989年   60608篇
  1988年   55561篇
  1987年   54046篇
  1986年   51245篇
  1985年   50986篇
  1984年   46698篇
  1983年   42712篇
  1982年   40797篇
  1981年   38397篇
  1980年   36326篇
  1979年   37691篇
  1978年   33383篇
  1977年   31361篇
  1976年   28157篇
  1975年   27054篇
  1974年   27230篇
  1973年   26202篇
  1972年   24593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