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   94316篇
  免费   9521篇
  国内免费   676篇
耳鼻咽喉   269篇
儿科学   2136篇
妇产科学   1798篇
基础医学   6096篇
口腔科学   4513篇
临床医学   18053篇
内科学   7917篇
皮肤病学   681篇
神经病学   5671篇
特种医学   973篇
外国民族医学   1篇
外科学   3860篇
综合类   9030篇
现状与发展   3篇
一般理论   93篇
预防医学   36125篇
眼科学   356篇
药学   3277篇
  102篇
中国医学   1086篇
肿瘤学   2473篇
  2024年   377篇
  2023年   2888篇
  2022年   3694篇
  2021年   5188篇
  2020年   5325篇
  2019年   5060篇
  2018年   4368篇
  2017年   4226篇
  2016年   4060篇
  2015年   3966篇
  2014年   6177篇
  2013年   8218篇
  2012年   5357篇
  2011年   5845篇
  2010年   4422篇
  2009年   4524篇
  2008年   4383篇
  2007年   4386篇
  2006年   3793篇
  2005年   2941篇
  2004年   2519篇
  2003年   2158篇
  2002年   1667篇
  2001年   1552篇
  2000年   1355篇
  1999年   956篇
  1998年   798篇
  1997年   650篇
  1996年   533篇
  1995年   370篇
  1994年   368篇
  1993年   360篇
  1992年   298篇
  1991年   250篇
  1990年   212篇
  1989年   176篇
  1988年   193篇
  1987年   126篇
  1986年   113篇
  1985年   121篇
  1984年   83篇
  1983年   59篇
  1982年   49篇
  1981年   55篇
  1980年   55篇
  1979年   40篇
  1978年   42篇
  1977年   49篇
  1976年   35篇
  1975年   38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.
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