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   3325356篇
  免费   269722篇
  国内免费   13552篇
耳鼻咽喉   45079篇
儿科学   102932篇
妇产科学   84342篇
基础医学   531488篇
口腔科学   89406篇
临床医学   298924篇
内科学   579254篇
皮肤病学   90821篇
神经病学   282345篇
特种医学   131782篇
外国民族医学   233篇
外科学   514216篇
综合类   100358篇
现状与发展   23篇
一般理论   2196篇
预防医学   274456篇
眼科学   76264篇
药学   233575篇
  27篇
中国医学   10006篇
肿瘤学   160903篇
  2021年   55149篇
  2020年   35135篇
  2019年   58026篇
  2018年   70998篇
  2017年   54124篇
  2016年   59866篇
  2015年   74101篇
  2014年   108342篇
  2013年   173489篇
  2012年   88867篇
  2011年   88174篇
  2010年   115890篇
  2009年   120600篇
  2008年   74924篇
  2007年   77453篇
  2006年   88534篇
  2005年   83523篇
  2004年   85304篇
  2003年   76374篇
  2002年   66047篇
  2001年   107523篇
  2000年   100319篇
  1999年   99177篇
  1998年   65090篇
  1997年   62902篇
  1996年   60647篇
  1995年   56217篇
  1994年   50099篇
  1993年   46846篇
  1992年   68237篇
  1991年   64593篇
  1990年   61663篇
  1989年   60753篇
  1988年   55731篇
  1987年   54240篇
  1986年   51417篇
  1985年   51123篇
  1984年   46804篇
  1983年   42821篇
  1982年   40840篇
  1981年   38414篇
  1980年   36361篇
  1979年   37802篇
  1978年   33459篇
  1977年   31441篇
  1976年   28225篇
  1975年   27137篇
  1974年   27327篇
  1973年   26284篇
  1972年   24702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.

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