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   1423285篇
  免费   123783篇
  国内免费   3908篇
耳鼻咽喉   21873篇
儿科学   42550篇
妇产科学   41009篇
基础医学   189639篇
口腔科学   44651篇
临床医学   137078篇
内科学   284372篇
皮肤病学   33322篇
神经病学   117242篇
特种医学   56890篇
外国民族医学   435篇
外科学   224513篇
综合类   31299篇
现状与发展   46篇
一般理论   439篇
预防医学   104397篇
眼科学   33422篇
药学   101233篇
  3篇
中国医学   3081篇
肿瘤学   83482篇
  2018年   18112篇
  2017年   16363篇
  2016年   17855篇
  2015年   19285篇
  2014年   26254篇
  2013年   36457篇
  2012年   36551篇
  2011年   38112篇
  2010年   26972篇
  2009年   28611篇
  2008年   36834篇
  2007年   38884篇
  2006年   40572篇
  2005年   37977篇
  2004年   36484篇
  2003年   35156篇
  2002年   34585篇
  2001年   65345篇
  2000年   66432篇
  1999年   56943篇
  1998年   16563篇
  1997年   15218篇
  1996年   14694篇
  1995年   13731篇
  1994年   12448篇
  1992年   43456篇
  1991年   41866篇
  1990年   41023篇
  1989年   40019篇
  1988年   37420篇
  1987年   36743篇
  1986年   35227篇
  1985年   33373篇
  1984年   25064篇
  1983年   21322篇
  1982年   12869篇
  1981年   11739篇
  1979年   23983篇
  1978年   17176篇
  1977年   14939篇
  1976年   13464篇
  1975年   15320篇
  1974年   18145篇
  1973年   17610篇
  1972年   16879篇
  1971年   15759篇
  1970年   14970篇
  1969年   14363篇
  1968年   13469篇
  1967年   12020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