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   1422181篇
  免费   123664篇
  国内免费   3877篇
耳鼻咽喉   21879篇
儿科学   42504篇
妇产科学   40969篇
基础医学   189441篇
口腔科学   44512篇
临床医学   136928篇
内科学   284070篇
皮肤病学   33277篇
神经病学   117366篇
特种医学   56858篇
外国民族医学   435篇
外科学   224364篇
综合类   31170篇
现状与发展   45篇
一般理论   448篇
预防医学   104668篇
眼科学   33314篇
药学   101083篇
  3篇
中国医学   2994篇
肿瘤学   83394篇
  2018年   18053篇
  2017年   16360篇
  2016年   17824篇
  2015年   19224篇
  2014年   26207篇
  2013年   36420篇
  2012年   36441篇
  2011年   38062篇
  2010年   26949篇
  2009年   28538篇
  2008年   36774篇
  2007年   38837篇
  2006年   40559篇
  2005年   37982篇
  2004年   36485篇
  2003年   35134篇
  2002年   34613篇
  2001年   65304篇
  2000年   66379篇
  1999年   56930篇
  1998年   16568篇
  1997年   15213篇
  1996年   14700篇
  1995年   13742篇
  1994年   12456篇
  1992年   43430篇
  1991年   41854篇
  1990年   41005篇
  1989年   40010篇
  1988年   37416篇
  1987年   36735篇
  1986年   35213篇
  1985年   33371篇
  1984年   25054篇
  1983年   21327篇
  1982年   12869篇
  1981年   11745篇
  1979年   23985篇
  1978年   17171篇
  1977年   14944篇
  1976年   13462篇
  1975年   15333篇
  1974年   18146篇
  1973年   17612篇
  1972年   16879篇
  1971年   15756篇
  1970年   14972篇
  1969年   14368篇
  1968年   13467篇
  1967年   12017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