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   1129276篇
  免费   77394篇
  国内免费   1674篇
耳鼻咽喉   15588篇
儿科学   35989篇
妇产科学   30062篇
基础医学   160353篇
口腔科学   30895篇
临床医学   100613篇
内科学   216119篇
皮肤病学   25141篇
神经病学   85886篇
特种医学   44673篇
外国民族医学   203篇
外科学   171772篇
综合类   22625篇
现状与发展   2篇
一般理论   362篇
预防医学   79359篇
眼科学   26173篇
药学   90100篇
  7篇
中国医学   2915篇
肿瘤学   69507篇
  2021年   8567篇
  2019年   8622篇
  2018年   12372篇
  2017年   9645篇
  2016年   10944篇
  2015年   12242篇
  2014年   16833篇
  2013年   24750篇
  2012年   33929篇
  2011年   35960篇
  2010年   21057篇
  2009年   19779篇
  2008年   33562篇
  2007年   35812篇
  2006年   36303篇
  2005年   34736篇
  2004年   33190篇
  2003年   31663篇
  2002年   30615篇
  2001年   60623篇
  2000年   62003篇
  1999年   51544篇
  1998年   13127篇
  1997年   11552篇
  1996年   11463篇
  1995年   10772篇
  1994年   9777篇
  1993年   9257篇
  1992年   38251篇
  1991年   36711篇
  1990年   36105篇
  1989年   34666篇
  1988年   31215篇
  1987年   30323篇
  1986年   28541篇
  1985年   26831篇
  1984年   19572篇
  1983年   16484篇
  1982年   9314篇
  1979年   17311篇
  1978年   11696篇
  1977年   10528篇
  1976年   9084篇
  1975年   10345篇
  1974年   11884篇
  1973年   11477篇
  1972年   10932篇
  1971年   10186篇
  1970年   9381篇
  1969年   9033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.
Quality of Life Research - The COVID-19 pandemic might add to the stressors experienced by people living with rheumatic diseases. This study aimed to examine rheumatic patients’ functional...  相似文献   
4.
Molnár  B.  Aroca  S.  Dobos  A.  Orbán  K.  Szabó  J.  Windisch  P.  Stähli  A.  Sculean  A. 《Clinical oral investigations》2022,26(12):7135-7142
Clinical Oral Investigations - To evaluate t he long-term outcomes following treatment of RT 1 multiple adjacent gingival recessions (MAGR) using the modified coronally advanced tunnel (MCAT) with...  相似文献   
5.
International Ophthalmology - To investigate the efficacy and safety of non-valved Aurolab aqueous drainage implant (AADI) surgery combined with phacoemulsification in eyes with refractory glaucoma...  相似文献   
6.
7.
8.
9.
10.
Inflammatory bowel disease (IBD) is a chronic disease that requires chronic treatment throughout the evolution of the disease, with a complex physiopathology that entails great challenges for the development of new and specific treatments for ulcerative colitis and Crohn´s disease. The anti-tumor necrosis factor alpha therapy has impacted the clinical course of IBD in those patients who do not respond to conventional treatment, so there is a need to develop new therapies and markers of treatment response. Various pathways involved in the development of the disease are known and the new therapies have focused on blocking the inflammatory process at the gastrointestinal level by oral, intravenous, subcutaneous, and topical route. All these new therapies can lead to more personalized treatments with higher success rates and fewer relapses. These treatments have not only focused on clinical remission, but also on achieving macroscopic changes at the endoscopic level and microscopic changes by achieving mucosal healing. These treatments are mainly based on modifying signaling pathways, by blocking receptors or ligands, reducing cell migration and maintaining the integrity of the epithelial barrier. Therefore, this review presents the efficacy and safety of the new treatments that are currently under study and the advances that have been made in this area in recent years.  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