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   5303679篇
  免费   399479篇
  国内免费   15723篇
耳鼻咽喉   76662篇
儿科学   173821篇
妇产科学   143764篇
基础医学   785363篇
口腔科学   147769篇
临床医学   481677篇
内科学   966488篇
皮肤病学   125910篇
神经病学   432180篇
特种医学   207256篇
外国民族医学   1391篇
外科学   805827篇
综合类   147732篇
现状与发展   23篇
一般理论   2883篇
预防医学   442573篇
眼科学   128038篇
药学   377994篇
  27篇
中国医学   13625篇
肿瘤学   257878篇
  2021年   57167篇
  2019年   59601篇
  2018年   77150篇
  2017年   59039篇
  2016年   65564篇
  2015年   77741篇
  2014年   112468篇
  2013年   178313篇
  2012年   149991篇
  2011年   160589篇
  2010年   134643篇
  2009年   133077篇
  2008年   146627篇
  2007年   158694篇
  2006年   165566篇
  2005年   160524篇
  2004年   160319篇
  2003年   150047篇
  2002年   139385篇
  2001年   203118篇
  2000年   200510篇
  1999年   180140篇
  1998年   77188篇
  1997年   71079篇
  1996年   69377篇
  1995年   64579篇
  1994年   58812篇
  1993年   54358篇
  1992年   134315篇
  1991年   131058篇
  1990年   127031篇
  1989年   123367篇
  1988年   114308篇
  1987年   112402篇
  1986年   106316篇
  1985年   103812篇
  1984年   83523篇
  1983年   73571篇
  1982年   53684篇
  1981年   49548篇
  1980年   46609篇
  1979年   75461篇
  1978年   58124篇
  1977年   50859篇
  1976年   47676篇
  1975年   49944篇
  1974年   56267篇
  1973年   54316篇
  1972年   51079篇
  1971年   47477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