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   3487105篇
  免费   297926篇
  国内免费   13953篇
耳鼻咽喉   47600篇
儿科学   109939篇
妇产科学   88380篇
基础医学   554379篇
口腔科学   93933篇
临床医学   316398篇
内科学   619145篇
皮肤病学   89874篇
神经病学   300835篇
特种医学   139010篇
外国民族医学   300篇
外科学   538641篇
综合类   106594篇
现状与发展   24篇
一般理论   2313篇
预防医学   297156篇
眼科学   79714篇
药学   240349篇
  24篇
中国医学   9600篇
肿瘤学   164776篇
  2021年   55352篇
  2020年   35247篇
  2019年   58301篇
  2018年   71723篇
  2017年   54654篇
  2016年   60344篇
  2015年   74419篇
  2014年   108806篇
  2013年   174012篇
  2012年   95625篇
  2011年   95834篇
  2010年   117582篇
  2009年   121721篇
  2008年   82650篇
  2007年   86349篇
  2006年   96787篇
  2005年   92118篇
  2004年   93986篇
  2003年   84611篇
  2002年   73764篇
  2001年   111126篇
  2000年   104692篇
  1999年   102313篇
  1998年   66332篇
  1997年   63902篇
  1996年   62093篇
  1995年   57802篇
  1994年   51828篇
  1993年   48413篇
  1992年   73520篇
  1991年   70234篇
  1990年   66556篇
  1989年   65115篇
  1988年   60391篇
  1987年   59056篇
  1986年   55879篇
  1985年   55985篇
  1984年   50445篇
  1983年   45792篇
  1982年   42578篇
  1981年   40002篇
  1980年   37699篇
  1979年   41784篇
  1978年   36591篇
  1977年   33149篇
  1976年   30477篇
  1975年   29042篇
  1974年   30280篇
  1973年   29041篇
  1972年   27041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