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   64656篇
  免费   4782篇
  国内免费   343篇
耳鼻咽喉   641篇
儿科学   1653篇
妇产科学   1564篇
基础医学   7984篇
口腔科学   1607篇
临床医学   6479篇
内科学   14706篇
皮肤病学   833篇
神经病学   5124篇
特种医学   1980篇
外国民族医学   2篇
外科学   9919篇
综合类   1063篇
现状与发展   1篇
一般理论   106篇
预防医学   5357篇
眼科学   1888篇
药学   4571篇
中国医学   144篇
肿瘤学   4159篇
  2023年   284篇
  2022年   442篇
  2021年   1238篇
  2020年   772篇
  2019年   1074篇
  2018年   1335篇
  2017年   894篇
  2016年   1010篇
  2015年   1185篇
  2014年   1834篇
  2013年   2876篇
  2012年   3887篇
  2011年   4212篇
  2010年   2426篇
  2009年   2264篇
  2008年   4081篇
  2007年   4280篇
  2006年   4092篇
  2005年   4195篇
  2004年   3888篇
  2003年   3505篇
  2002年   3464篇
  2001年   750篇
  2000年   641篇
  1999年   737篇
  1998年   759篇
  1997年   615篇
  1996年   499篇
  1995年   496篇
  1994年   467篇
  1993年   447篇
  1992年   543篇
  1991年   517篇
  1990年   427篇
  1989年   444篇
  1988年   401篇
  1987年   381篇
  1986年   363篇
  1985年   425篇
  1984年   439篇
  1983年   397篇
  1982年   532篇
  1981年   444篇
  1980年   488篇
  1979年   306篇
  1978年   325篇
  1977年   322篇
  1976年   263篇
  1975年   291篇
  1974年   249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.
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   
3.
4.
5.
6.
7.

Background

The Lancet Commission on Global Surgery highlighted global surgical need but offered little insight into the specific surgical challenges of children in low-resource settings. Efforts to strengthen the quality of global pediatric surgical care have resulted in a proliferation of partnerships between low-and middle-income countries (LMICs) and high-income countries (HICs). Standardized tools able to reliably measure gaps in delivery and quality of care are important aids for these partnerships. We undertook a systematic review (SR) of capacity assessment tools (CATs) focused on needs assessment in pediatric surgery.

Methods

A comprehensive search strategy of multiple electronic databases was conducted per PRISMA guidelines without linguistic or temporal restrictions. CATs were selected according to pre-defined inclusion criteria. Articles were assessed by two independent reviewers. Methodological quality of studies was appraised using the COSMIN checklist with 4-point scale.

Results

The search strategy generated 16,641 original publications, of which three CATs were deemed eligible. Eligible tools were either excessively detailed or oversimplified. None used weighted scores to identify finer granularity between institutions. No CATs comprehensively included measures of resources, outcomes, accessibility/impact and training.

Discussion

The results of this study identify the need for a CAT capable of objectively measuring key aspects of surgical capacity and performance in a weighted tool designed for pediatric surgical centers in LMICs.

Type of Study

Systematic Review.

Level of Evidence

II.  相似文献   
8.
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