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   4750037篇
  免费   362125篇
  国内免费   15601篇
耳鼻咽喉   66653篇
儿科学   153126篇
妇产科学   126477篇
基础医学   714517篇
口腔科学   130534篇
临床医学   431493篇
内科学   866205篇
皮肤病学   114587篇
神经病学   397150篇
特种医学   185635篇
外国民族医学   1035篇
外科学   716691篇
综合类   131935篇
现状与发展   24篇
一般理论   2740篇
预防医学   391630篇
眼科学   111065篇
药学   336371篇
  26篇
中国医学   12788篇
肿瘤学   237081篇
  2021年   56505篇
  2019年   59178篇
  2018年   75483篇
  2017年   57986篇
  2016年   64277篇
  2015年   76744篇
  2014年   110972篇
  2013年   176646篇
  2012年   134687篇
  2011年   142127篇
  2010年   129546篇
  2009年   129959篇
  2008年   127818篇
  2007年   136521篇
  2006年   144637篇
  2005年   138922篇
  2004年   139686篇
  2003年   129928篇
  2002年   119080篇
  2001年   184591篇
  2000年   180430篇
  1999年   163946篇
  1998年   73782篇
  1997年   69139篇
  1996年   67119篇
  1995年   62490篇
  1994年   56425篇
  1993年   52349篇
  1992年   119564篇
  1991年   114046篇
  1990年   109949篇
  1989年   107079篇
  1988年   98710篇
  1987年   96744篇
  1986年   91513篇
  1985年   88953篇
  1984年   72983篇
  1983年   64533篇
  1982年   49877篇
  1981年   46096篇
  1980年   43241篇
  1979年   63128篇
  1978年   49967篇
  1977年   44191篇
  1976年   41043篇
  1975年   41640篇
  1974年   46015篇
  1973年   44108篇
  1972年   41373篇
  1971年   38158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.
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