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   4060369篇
  免费   334128篇
  国内免费   14172篇
耳鼻咽喉   57507篇
儿科学   130530篇
妇产科学   107456篇
基础医学   622649篇
口腔科学   111117篇
临床医学   365588篇
内科学   728793篇
皮肤病学   104567篇
神经病学   336707篇
特种医学   163804篇
外国民族医学   885篇
外科学   629080篇
综合类   117700篇
现状与发展   23篇
一般理论   2442篇
预防医学   330614篇
眼科学   95383篇
药学   291540篇
  23篇
中国医学   11069篇
肿瘤学   201192篇
  2021年   50152篇
  2020年   35548篇
  2019年   58603篇
  2018年   73138篇
  2017年   55557篇
  2016年   61561篇
  2015年   75073篇
  2014年   109553篇
  2013年   174974篇
  2012年   110629篇
  2011年   113657篇
  2010年   122476篇
  2009年   125154篇
  2008年   100517篇
  2007年   106550篇
  2006年   116124篇
  2005年   111132篇
  2004年   112554篇
  2003年   103132篇
  2002年   92555篇
  2001年   152920篇
  2000年   148214篇
  1999年   136765篇
  1998年   64703篇
  1997年   60778篇
  1996年   58737篇
  1995年   59453篇
  1994年   53587篇
  1993年   49839篇
  1992年   99916篇
  1991年   96136篇
  1990年   92475篇
  1989年   89920篇
  1988年   82539篇
  1987年   80803篇
  1986年   76039篇
  1985年   74728篇
  1984年   62920篇
  1983年   55917篇
  1982年   45805篇
  1981年   42801篇
  1980年   40170篇
  1979年   53001篇
  1978年   42986篇
  1977年   38993篇
  1976年   35538篇
  1975年   35727篇
  1974年   38090篇
  1973年   36724篇
  1972年   34400篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.

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   
63.
64.
65.
Journal of Immigrant and Minority Health - COVID-19 has disproportionally affected underrepresented minorities (URM) and low-income immigrants in the United States. The aim of the study is to...  相似文献   
66.
Vaccination is a vital health care initiative to prevent individual and population infection. To increase vaccination rates the federal government implemented the ‘No Jab, No Pay’ policy, where eligibility for several government benefits required children to be fully vaccinated by removing ‘conscientious objections’ and expanding the age range of children whose families receive benefits. This study assesses the impact of this policy at a local area within a single medical practice community in NSW, Australia. A retrospective clinical audit was performed between 2012 and 2017 on a single general practice's vaccination records for children ≤19 years. Catch-up vaccinations were assessed based on age at vaccination. Incidence of catch-up vaccinations was assessed for each of four years before and two years after the implementation of the ‘No Jab, No Pay’ policy in January 2016, along with the age of children and vaccination(s) given. Catch-up vaccinations were assessed temporally either side of implementation of ‘No Jab, No Pay’. Comparing the average annual vaccination catch-up incidence rate of 6.2% pre-implementation (2012–2015), there was an increase to 9.2% in 2016 (p < .001) and 7.8% in 2017 (p = .027). Secondary outcome measurement of catch-up vaccination incidence rates before (2012–2015) and after (2016–2017) ‘No Jab, No Pay’ implementation showed statistically significant increases for children aged 8–11 years (3.2%–5.6%, p = .038), 12–15 years (7.5%–14.7%, p < .001) and 16–19 years (3.3%–10.2%, p < .001) along with a statistically significant reduction in children aged 1–3 years (11.4%–6.2%, p = .015). Also, catch-up rates for DTPa significantly increased after program implementation. This study demonstrates that the Australian federal government vaccination policy ‘No Jab, No Pay’ was coincident with an increase in catch-up vaccinations within a rural NSW community served by one medical practice, especially for older children.  相似文献   
67.
Medicine, Health Care and Philosophy - In this paper, I will provide a phenomenological analysis of somatic obsessions at times present in obsessive–compulsive disorder. I will compare two...  相似文献   
68.
Münch  F.  Purbojo  A.  Wenzel  F.  Kohl  M.  Dittrich  S.  Rauh  M.  Zimmermann  R.  Kwapil  N. 《Der Anaesthesist》2022,71(11):882-892
Die Anaesthesiologie - Die Transfusion von Erythrozytenkonzentraten (EK) ist mit verschiedenen Nebenwirkungen assoziiert, die u. a. durch Lagerungsschäden an Erythrozyten hervorgerufen...  相似文献   
69.
70.
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