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   2947100篇
  免费   255905篇
  国内免费   13482篇
耳鼻咽喉   41380篇
儿科学   93068篇
妇产科学   73555篇
基础医学   478348篇
口腔科学   78327篇
临床医学   270652篇
内科学   506578篇
皮肤病学   86390篇
神经病学   254751篇
特种医学   115255篇
外国民族医学   88篇
外科学   471063篇
综合类   88536篇
现状与发展   91篇
一般理论   2097篇
预防医学   250048篇
眼科学   67891篇
药学   195835篇
  22篇
中国医学   8545篇
肿瘤学   133967篇
  2022年   23055篇
  2021年   55324篇
  2020年   37012篇
  2019年   58253篇
  2018年   72697篇
  2017年   56023篇
  2016年   61550篇
  2015年   76164篇
  2014年   112803篇
  2013年   177628篇
  2012年   76736篇
  2011年   74895篇
  2010年   116272篇
  2009年   123135篇
  2008年   62705篇
  2007年   62818篇
  2006年   75320篇
  2005年   70238篇
  2004年   72163篇
  2003年   63236篇
  2002年   53502篇
  2001年   75178篇
  2000年   66899篇
  1999年   72515篇
  1998年   63354篇
  1997年   61585篇
  1996年   59044篇
  1995年   54458篇
  1994年   48320篇
  1993年   45137篇
  1992年   48180篇
  1991年   46643篇
  1990年   44153篇
  1989年   44176篇
  1988年   40996篇
  1987年   40155篇
  1986年   38199篇
  1985年   39010篇
  1984年   38618篇
  1983年   36144篇
  1982年   38166篇
  1981年   36383篇
  1980年   34396篇
  1979年   30947篇
  1978年   29775篇
  1977年   27790篇
  1976年   25514篇
  1975年   24167篇
  1974年   23894篇
  1973年   22668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