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   1433289篇
  免费   124677篇
  国内免费   3931篇
耳鼻咽喉   21951篇
儿科学   42786篇
妇产科学   40994篇
基础医学   191003篇
口腔科学   45016篇
临床医学   138054篇
内科学   286201篇
皮肤病学   33388篇
神经病学   118723篇
特种医学   57243篇
外国民族医学   435篇
外科学   225898篇
综合类   31501篇
现状与发展   45篇
一般理论   444篇
预防医学   105727篇
眼科学   33638篇
药学   101853篇
  5篇
中国医学   3003篇
肿瘤学   83989篇
  2018年   18115篇
  2017年   16440篇
  2016年   17935篇
  2015年   19339篇
  2014年   26394篇
  2013年   36676篇
  2012年   36785篇
  2011年   38584篇
  2010年   27195篇
  2009年   28763篇
  2008年   37179篇
  2007年   39296篇
  2006年   40988篇
  2005年   38438篇
  2004年   36926篇
  2003年   35634篇
  2002年   35115篇
  2001年   65697篇
  2000年   66846篇
  1999年   57274篇
  1998年   16745篇
  1997年   15369篇
  1996年   14848篇
  1995年   13855篇
  1994年   12563篇
  1992年   43680篇
  1991年   42086篇
  1990年   41252篇
  1989年   40212篇
  1988年   37656篇
  1987年   36927篇
  1986年   35396篇
  1985年   33548篇
  1984年   25201篇
  1983年   21455篇
  1982年   12996篇
  1981年   11845篇
  1979年   24130篇
  1978年   17275篇
  1977年   15026篇
  1976年   13555篇
  1975年   15399篇
  1974年   18252篇
  1973年   17707篇
  1972年   16945篇
  1971年   15831篇
  1970年   15018篇
  1969年   14408篇
  1968年   13517篇
  1967年   12073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.

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