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   3390869篇
  免费   273477篇
  国内免费   13634篇
耳鼻咽喉   45584篇
儿科学   104397篇
妇产科学   85763篇
基础医学   541220篇
口腔科学   91347篇
临床医学   304145篇
内科学   592789篇
皮肤病学   91522篇
神经病学   288511篇
特种医学   133861篇
外国民族医学   234篇
外科学   521249篇
综合类   100605篇
现状与发展   23篇
一般理论   2259篇
预防医学   284284篇
眼科学   77231篇
药学   237233篇
  27篇
中国医学   10123篇
肿瘤学   165573篇
  2021年   55470篇
  2020年   35324篇
  2019年   58312篇
  2018年   71585篇
  2017年   54637篇
  2016年   60423篇
  2015年   74546篇
  2014年   108942篇
  2013年   174210篇
  2012年   93561篇
  2011年   93063篇
  2010年   117124篇
  2009年   121812篇
  2008年   79591篇
  2007年   82507篇
  2006年   93138篇
  2005年   87839篇
  2004年   88986篇
  2003年   79867篇
  2002年   69283篇
  2001年   110369篇
  2000年   103199篇
  1999年   101612篇
  1998年   65558篇
  1997年   63245篇
  1996年   61001篇
  1995年   56514篇
  1994年   50392篇
  1993年   47107篇
  1992年   69918篇
  1991年   66051篇
  1990年   63022篇
  1989年   62037篇
  1988年   56930篇
  1987年   55249篇
  1986年   52376篇
  1985年   52056篇
  1984年   47362篇
  1983年   43289篇
  1982年   41008篇
  1981年   38575篇
  1980年   36461篇
  1979年   38314篇
  1978年   33695篇
  1977年   31585篇
  1976年   28362篇
  1975年   27245篇
  1974年   27509篇
  1973年   26486篇
  1972年   24863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