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   3447985篇
  免费   295996篇
  国内免费   13890篇
耳鼻咽喉   47311篇
儿科学   108883篇
妇产科学   87656篇
基础医学   549337篇
口腔科学   93048篇
临床医学   312185篇
内科学   611273篇
皮肤病学   89531篇
神经病学   297201篇
特种医学   137952篇
外国民族医学   299篇
外科学   533602篇
综合类   105984篇
现状与发展   24篇
一般理论   2264篇
预防医学   293333篇
眼科学   78696篇
药学   237393篇
  24篇
中国医学   9548篇
肿瘤学   162327篇
  2021年   55074篇
  2020年   35050篇
  2019年   58052篇
  2018年   71290篇
  2017年   54254篇
  2016年   59938篇
  2015年   74071篇
  2014年   108370篇
  2013年   173370篇
  2012年   91985篇
  2011年   91834篇
  2010年   116471篇
  2009年   120954篇
  2008年   78961篇
  2007年   82132篇
  2006年   92759篇
  2005年   88305篇
  2004年   90301篇
  2003年   81243篇
  2002年   70381篇
  2001年   110990篇
  2000年   104591篇
  1999年   102168篇
  1998年   66161篇
  1997年   63782篇
  1996年   61985篇
  1995年   57736篇
  1994年   51748篇
  1993年   48346篇
  1992年   73465篇
  1991年   70191篇
  1990年   66518篇
  1989年   65089篇
  1988年   60357篇
  1987年   59027篇
  1986年   55842篇
  1985年   55952篇
  1984年   50405篇
  1983年   45746篇
  1982年   42537篇
  1981年   39964篇
  1980年   37664篇
  1979年   41755篇
  1978年   36554篇
  1977年   33111篇
  1976年   30448篇
  1975年   29026篇
  1974年   30261篇
  1973年   29027篇
  1972年   27027篇
排序方式: 共有10000条查询结果,搜索用时 4 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