全文获取类型
收费全文 | 105879篇 |
免费 | 10050篇 |
国内免费 | 819篇 |
专业分类
耳鼻咽喉 | 291篇 |
儿科学 | 2452篇 |
妇产科学 | 1846篇 |
基础医学 | 8853篇 |
口腔科学 | 4598篇 |
临床医学 | 17815篇 |
内科学 | 8991篇 |
皮肤病学 | 745篇 |
神经病学 | 8786篇 |
特种医学 | 995篇 |
外国民族医学 | 1篇 |
外科学 | 3733篇 |
综合类 | 9660篇 |
现状与发展 | 3篇 |
一般理论 | 90篇 |
预防医学 | 38924篇 |
眼科学 | 358篇 |
药学 | 5241篇 |
86篇 | |
中国医学 | 1062篇 |
肿瘤学 | 2218篇 |
出版年
2024年 | 403篇 |
2023年 | 2991篇 |
2022年 | 4082篇 |
2021年 | 5723篇 |
2020年 | 5579篇 |
2019年 | 5267篇 |
2018年 | 4595篇 |
2017年 | 4484篇 |
2016年 | 4328篇 |
2015年 | 4239篇 |
2014年 | 6701篇 |
2013年 | 8974篇 |
2012年 | 5820篇 |
2011年 | 6452篇 |
2010年 | 4771篇 |
2009年 | 4968篇 |
2008年 | 4896篇 |
2007年 | 4872篇 |
2006年 | 4248篇 |
2005年 | 3294篇 |
2004年 | 2819篇 |
2003年 | 2489篇 |
2002年 | 1937篇 |
2001年 | 1767篇 |
2000年 | 1505篇 |
1999年 | 1113篇 |
1998年 | 930篇 |
1997年 | 771篇 |
1996年 | 641篇 |
1995年 | 484篇 |
1994年 | 455篇 |
1993年 | 441篇 |
1992年 | 390篇 |
1991年 | 346篇 |
1990年 | 285篇 |
1989年 | 256篇 |
1988年 | 282篇 |
1987年 | 209篇 |
1986年 | 245篇 |
1985年 | 350篇 |
1984年 | 313篇 |
1983年 | 223篇 |
1982年 | 255篇 |
1981年 | 238篇 |
1980年 | 242篇 |
1979年 | 211篇 |
1978年 | 163篇 |
1977年 | 175篇 |
1976年 | 163篇 |
1975年 | 126篇 |
排序方式: 共有10000条查询结果,搜索用时 0 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 Journal for Nurse Practitioners》2022,18(4):372-376
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.
Anela Stanic Denis Rybin Francis Cannata Carole Hohl Jennifer Brody Jessie Gaeta 《AIDS care》2021,33(1):1-9
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