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   1429767篇
  免费   124170篇
  国内免费   3897篇
耳鼻咽喉   21929篇
儿科学   42721篇
妇产科学   41143篇
基础医学   190769篇
口腔科学   44718篇
临床医学   137931篇
内科学   285360篇
皮肤病学   33589篇
神经病学   118058篇
特种医学   56984篇
外国民族医学   435篇
外科学   224916篇
综合类   31204篇
现状与发展   45篇
一般理论   456篇
预防医学   105363篇
眼科学   33454篇
药学   101746篇
  3篇
中国医学   3015篇
肿瘤学   83995篇
  2018年   18364篇
  2017年   16543篇
  2016年   18099篇
  2015年   19476篇
  2014年   26572篇
  2013年   36818篇
  2012年   37053篇
  2011年   38716篇
  2010年   27308篇
  2009年   28814篇
  2008年   37209篇
  2007年   39360篇
  2006年   41029篇
  2005年   38420篇
  2004年   36858篇
  2003年   35495篇
  2002年   34920篇
  2001年   65323篇
  2000年   66407篇
  1999年   56955篇
  1998年   16624篇
  1997年   15243篇
  1996年   14725篇
  1995年   13765篇
  1994年   12495篇
  1992年   43444篇
  1991年   41867篇
  1990年   41018篇
  1989年   40027篇
  1988年   37433篇
  1987年   36737篇
  1986年   35221篇
  1985年   33378篇
  1984年   25066篇
  1983年   21336篇
  1982年   12883篇
  1981年   11764篇
  1979年   23988篇
  1978年   17182篇
  1977年   14953篇
  1976年   13472篇
  1975年   15326篇
  1974年   18153篇
  1973年   17613篇
  1972年   16877篇
  1971年   15757篇
  1970年   14966篇
  1969年   14365篇
  1968年   13464篇
  1967年   12015篇
排序方式: 共有10000条查询结果,搜索用时 31 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.

Interstitial lung disease (ILD) represents a significant cause of morbidity and mortality in systemic sclerosis (SSc). The purpose of this study was to examine recirculating lymphocytes from SSc patients for potential biomarkers of interstitial lung disease (ILD). Peripheral blood mononuclear cells (PBMCs) were isolated from patients with SSc and healthy controls enrolled in the Vanderbilt University Myositis and Scleroderma Treatment Initiative Center cohort between 9/2017–6/2019. Clinical phenotyping was performed by chart abstraction. Immunophenotyping was performed using both mass cytometry and fluorescence cytometry combined with t-distributed stochastic neighbor embedding analysis and traditional biaxial gating. This study included 34 patients with SSc-ILD, 14 patients without SSc-ILD, and 25 healthy controls. CD21lo/neg cells are significantly increased in SSc-ILD but not in SSc without ILD (15.4 ± 13.3% vs. 5.8 ± 0.9%, p = 0.002) or healthy controls (5.0 ± 0.5%, p < 0.0001). While CD21lo/neg B cells can be identified from a single biaxial gate, tSNE analysis reveals that the biaxial gate is comprised of multiple distinct subsets, all of which are increased in SSc-ILD. CD21lo/neg cells in both healthy controls and SSc-ILD are predominantly tBET positive and do not have intracellular CD21. Immunohistochemistry staining demonstrated that CD21lo/neg B cells diffusely infiltrate the lung parenchyma of an SSc-ILD patient. Additional work is needed to validate this biomarker in larger cohorts and longitudinal studies and to understand the role of these cells in SSc-ILD.

  相似文献   
5.
6.
7.
8.
Die Anaesthesiologie - Auch wenn für Anästhesiologen über Jahrzehnte die Prophylaxe und Therapie postoperativer Schmerzen im Rahmen des postoperativen Patientenkomforts an vorderster...  相似文献   
9.
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