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   111756篇
  免费   31009篇
  国内免费   1083篇
耳鼻咽喉   2542篇
儿科学   3188篇
妇产科学   2807篇
基础医学   4375篇
口腔科学   5158篇
临床医学   29100篇
内科学   26754篇
皮肤病学   3570篇
神经病学   13453篇
特种医学   3769篇
外科学   18973篇
综合类   258篇
现状与发展   40篇
一般理论   34篇
预防医学   15494篇
眼科学   2269篇
药学   2111篇
  2篇
中国医学   13篇
肿瘤学   9938篇
  2024年   543篇
  2023年   5069篇
  2022年   1191篇
  2021年   3015篇
  2020年   5492篇
  2019年   2319篇
  2018年   7225篇
  2017年   7614篇
  2016年   8193篇
  2015年   8291篇
  2014年   10834篇
  2013年   12741篇
  2012年   4849篇
  2011年   4598篇
  2010年   7396篇
  2009年   9597篇
  2008年   4505篇
  2007年   3568篇
  2006年   4715篇
  2005年   3184篇
  2004年   2576篇
  2003年   2165篇
  2002年   2012篇
  2001年   1919篇
  2000年   1189篇
  1999年   1777篇
  1998年   2259篇
  1997年   2042篇
  1996年   2089篇
  1995年   1810篇
  1994年   1216篇
  1993年   1005篇
  1992年   801篇
  1991年   700篇
  1990年   570篇
  1989年   573篇
  1988年   569篇
  1987年   439篇
  1986年   413篇
  1985年   340篇
  1984年   304篇
  1983年   334篇
  1982年   287篇
  1981年   267篇
  1980年   182篇
  1979年   99篇
  1978年   157篇
  1977年   146篇
  1976年   105篇
  1974年   92篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.

Objective

The aim of the study was to estimate the effect of the state-based reinsurance programs through the section 1332 State Innovation Waivers on health insurance marketplace premiums and insurer participation.

Data Source

2015 to 2022 Robert Wood Johnson Foundation Health Insurance Exchange Compare Datasets.

Study Design

An event study difference-in-differences (DD) model separately for each year of implementation and a synthetic control method (SCM) are used to estimate year-by-year effects following program implementation.

Data Collection/Extraction Methods

Not applicable.

Principal Findings

Reinsurance programs were associated with a decline in premiums in the first year of implementation by 10%–13%, 5%–19%, and 11%–17% for bronze, silver, and gold plans (p < 0.05). There is a trend of sustained declines especially for states that implemented their programs in 2019 and 2020. The SCM analyses suggest some effect heterogeneity across states but also premium declines across most states. There is no evidence that reinsurance programs affected insurer participation.

Conclusion

State-based reinsurance programs have the potential to improve the affordability of health insurance coverage. However, reinsurance programs do not appear to have had an effect on insurer participation, highlighting the need for policy makers to consider complementary strategies to encourage insurer participation.  相似文献   
2.
3.
4.
5.
6.
7.
8.
9.
BackgroundTotal hip and knee arthroplasties are increasingly performed operations, and routine follow-up places huge demands on orthopedic services. This study investigates the effectiveness, patients’ satisfaction, and cost reduction of Virtual Joint Replacement Clinic (VJRC) follow-up of total hip arthroplasty and total knee arthroplasty patients in a university hospital. VJRC is especially valuable when in-person appointments are not advised or feasible such as during the COVID-19 pandemic.MethodsA total of 1749 patients who were invited for VJRC follow-up for knee or hip arthroplasty from January 2017 to December 2018 were included in this retrospective study. Patients were referred to VJRC after their 6-week postoperative review. Routine VJRC postoperative review was undertaken at 1 and 7 years and then 3-yearly thereafter. We evaluated the VJRC patient response rate, acceptability, and outcome. Patient satisfaction was measured in a subgroup of patients using a satisfaction survey. VJRC costs were calculated compared to face-to-face follow-up.ResultsThe VJRC had a 92.05% overall response rate. Only 7.22% required further in-person appointments with only 3% being reviewed by an orthopedic consultant. VJRC resulted in an estimated saving of £42,644 per year at our institution. The patients’ satisfaction survey showed that 89.29% of the patients were either satisfied or very satisfied with VJRC follow-up.ConclusionVJRC follow-up for hip and knee arthroplasty patients is an effective alternative to in-person clinic assessment which is accepted by patients, has high patient satisfaction, and can reduce the cost to both health services and patients.  相似文献   
10.
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