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   139276篇
  免费   33064篇
  国内免费   1158篇
耳鼻咽喉   2806篇
儿科学   4253篇
妇产科学   3482篇
基础医学   8012篇
口腔科学   5388篇
临床医学   31391篇
内科学   31790篇
皮肤病学   4153篇
神经病学   16519篇
特种医学   4371篇
外科学   22275篇
综合类   490篇
现状与发展   41篇
一般理论   86篇
预防医学   19384篇
眼科学   2862篇
药学   4184篇
中国医学   65篇
肿瘤学   11946篇
  2024年   575篇
  2023年   5316篇
  2022年   1574篇
  2021年   4312篇
  2020年   6159篇
  2019年   3615篇
  2018年   8498篇
  2017年   8530篇
  2016年   9145篇
  2015年   9311篇
  2014年   12321篇
  2013年   14612篇
  2012年   7782篇
  2011年   7467篇
  2010年   8875篇
  2009年   10772篇
  2008年   6537篇
  2007年   5435篇
  2006年   6387篇
  2005年   4768篇
  2004年   3783篇
  2003年   3074篇
  2002年   2731篇
  2001年   1979篇
  2000年   1237篇
  1999年   1848篇
  1998年   2325篇
  1997年   2082篇
  1996年   2089篇
  1995年   1809篇
  1994年   1176篇
  1993年   995篇
  1992年   800篇
  1991年   677篇
  1990年   553篇
  1989年   568篇
  1988年   536篇
  1987年   396篇
  1986年   375篇
  1985年   318篇
  1984年   282篇
  1983年   334篇
  1982年   237篇
  1981年   212篇
  1980年   139篇
  1978年   142篇
  1977年   131篇
  1976年   100篇
  1975年   81篇
  1972年   82篇
排序方式: 共有10000条查询结果,搜索用时 250 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