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   139348篇
  免费   33097篇
  国内免费   1159篇
耳鼻咽喉   2805篇
儿科学   4251篇
妇产科学   3468篇
基础医学   8015篇
口腔科学   5407篇
临床医学   31409篇
内科学   31813篇
皮肤病学   4159篇
神经病学   16547篇
特种医学   4381篇
外科学   22200篇
综合类   493篇
现状与发展   41篇
一般理论   87篇
预防医学   19439篇
眼科学   2859篇
药学   4194篇
中国医学   65篇
肿瘤学   11971篇
  2024年   575篇
  2023年   5318篇
  2022年   1604篇
  2021年   4315篇
  2020年   6163篇
  2019年   3617篇
  2018年   8495篇
  2017年   8531篇
  2016年   9157篇
  2015年   9317篇
  2014年   12326篇
  2013年   14612篇
  2012年   7796篇
  2011年   7478篇
  2010年   8876篇
  2009年   10778篇
  2008年   6547篇
  2007年   5441篇
  2006年   6371篇
  2005年   4774篇
  2004年   3789篇
  2003年   3085篇
  2002年   2735篇
  2001年   1986篇
  2000年   1239篇
  1999年   1852篇
  1998年   2325篇
  1997年   2088篇
  1996年   2088篇
  1995年   1814篇
  1994年   1172篇
  1993年   997篇
  1992年   806篇
  1991年   667篇
  1990年   551篇
  1989年   558篇
  1988年   536篇
  1987年   398篇
  1986年   374篇
  1985年   319篇
  1984年   280篇
  1983年   331篇
  1982年   235篇
  1981年   214篇
  1980年   137篇
  1978年   139篇
  1977年   134篇
  1976年   97篇
  1975年   78篇
  1972年   82篇
排序方式: 共有10000条查询结果,搜索用时 31 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.
The coronavirus disease 2019 (COVID-19) pandemic has rapidly created widespread impacts on global health and the economy. Data suggest that women are less susceptible to severe illness. However, sex-disaggregated data are incomplete, leaving room for misinterpretation, and focusing only on biologic sex underestimates the gendered impact of the pandemic on women. This narrative review summarizes what is known about gender disparities during the COVID-19 pandemic and the economic, domestic, and health burdens along with overlapping vulnerabilities related to the pandemic. In addition, this review outlines recommended strategies that advocacy groups, community leaders, and policymakers should implement to mitigate the widening gender disparities related to COVID-19.  相似文献   
10.
ABSTRACT

The lack of stable housing can impair access and continuity of care for patients living with human immunodeficiency virus (HIV). This study investigated the relationship between housing status assessed at multiple time points and several core HIV-related outcomes within the same group of HIV patients experiencing homelessness. Patients with consistently stable housing (CSH) during the year were compared to patients who lacked CSH (non-CSH group). The study outcomes included HIV viral load (VL), CD4 counts, and health care utilization. Multivariable and propensity weighted analyses were used to assess outcomes adjusting for potential group differences. Of 208 patients, 88 (42%) had CSH and 120 (58%) were non-CSH. Patients with CSH had significantly higher proportion of VL suppression and higher mean CD4 counts. The frequency of nurse visits in the CSH group was less than a half of that in the non-CSH group. Patients with CSH were less likely to be admitted to the medical respite facility, and if admitted, their length of stay was about a half of that for the non-CSH group. Our study findings show that patients with CSH had significantly better HIV virologic control and immune status as well as improved health care utilization.  相似文献   
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