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   100109篇
  免费   10177篇
  国内免费   723篇
耳鼻咽喉   435篇
儿科学   6311篇
妇产科学   1789篇
基础医学   6237篇
口腔科学   4607篇
临床医学   17490篇
内科学   8315篇
皮肤病学   730篇
神经病学   5879篇
特种医学   954篇
外国民族医学   1篇
外科学   4103篇
综合类   9354篇
现状与发展   4篇
一般理论   91篇
预防医学   37554篇
眼科学   416篇
药学   3427篇
  86篇
中国医学   1064篇
肿瘤学   2162篇
  2024年   395篇
  2023年   2964篇
  2022年   3941篇
  2021年   5408篇
  2020年   5594篇
  2019年   5425篇
  2018年   4694篇
  2017年   4508篇
  2016年   4437篇
  2015年   4242篇
  2014年   6400篇
  2013年   8535篇
  2012年   5782篇
  2011年   6194篇
  2010年   4646篇
  2009年   4646篇
  2008年   4535篇
  2007年   4674篇
  2006年   4083篇
  2005年   3127篇
  2004年   2671篇
  2003年   2333篇
  2002年   1821篇
  2001年   1706篇
  2000年   1451篇
  1999年   1069篇
  1998年   887篇
  1997年   730篇
  1996年   599篇
  1995年   452篇
  1994年   410篇
  1993年   413篇
  1992年   316篇
  1991年   291篇
  1990年   241篇
  1989年   191篇
  1988年   226篇
  1987年   146篇
  1986年   129篇
  1985年   133篇
  1984年   95篇
  1983年   62篇
  1982年   63篇
  1981年   48篇
  1980年   59篇
  1979年   37篇
  1978年   41篇
  1977年   40篇
  1976年   41篇
  1975年   35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.
The effects of climate change include floods, hurricanes, heat waves, and fires; these natural disasters can result in respiratory, cardiovascular, and psychological harm in older adults, who experience the highest morbidity and mortality during heat waves. Advanced practice registered nurses (APRNs) need education on preparing, assessing, and treating older adults for climate-change disasters, especially heat waves. This article will help APRNs understand the effects of climate-change events on the vulnerable older adults and advocates for the need to integrate health effects of climate change into curricula, practicums, policy, and research agendas.  相似文献   
5.
6.
Child benefits are typically paid from birth. This paper asks whether starting universal child benefits in pregnancy leads to improvements in infant health. Leveraging administrative birth registry and hospital microdata from England and Wales, I study the effects of the Health in Pregnancy Grant, a universal conditional cash transfer equivalent to three months of child benefit (190 GBP) as a lump sum to pregnant mothers from 2009 to 2011. I exploit quasi-experimental variation in eligibility with a regression discontinuity design in the date of birth of the baby. I find that the policy increased birth weight by 8–12 grams on average, reduced low birth weight (<2500 g) by 3-6 percent and decreased prematurity by 9–11 percent. Younger mothers, particularly those living in deprived areas, benefit the most. I present evidence that the mechanisms are unlikely to be antenatal care, nutrition or smoking, with reductions in stress remaining a possible explanation.  相似文献   
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.
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