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   183882篇
  免费   12779篇
  国内免费   858篇
耳鼻咽喉   1932篇
儿科学   5144篇
妇产科学   3576篇
基础医学   23937篇
口腔科学   3703篇
临床医学   18320篇
内科学   39866篇
皮肤病学   2271篇
神经病学   16774篇
特种医学   5675篇
外国民族医学   3篇
外科学   27108篇
综合类   2639篇
现状与发展   2篇
一般理论   259篇
预防医学   15804篇
眼科学   5065篇
药学   12999篇
  1篇
中国医学   408篇
肿瘤学   12033篇
  2023年   819篇
  2022年   1438篇
  2021年   3461篇
  2020年   2100篇
  2019年   3361篇
  2018年   3973篇
  2017年   2857篇
  2016年   3302篇
  2015年   3827篇
  2014年   5636篇
  2013年   8276篇
  2012年   12081篇
  2011年   13030篇
  2010年   7220篇
  2009年   6738篇
  2008年   11895篇
  2007年   12552篇
  2006年   11945篇
  2005年   12069篇
  2004年   11368篇
  2003年   10396篇
  2002年   10095篇
  2001年   1907篇
  2000年   1504篇
  1999年   1933篇
  1998年   2170篇
  1997年   1814篇
  1996年   1428篇
  1995年   1416篇
  1994年   1249篇
  1993年   1210篇
  1992年   1185篇
  1991年   1110篇
  1990年   952篇
  1989年   935篇
  1988年   891篇
  1987年   847篇
  1986年   770篇
  1985年   912篇
  1984年   987篇
  1983年   906篇
  1982年   1215篇
  1981年   1042篇
  1980年   1009篇
  1979年   665篇
  1978年   661篇
  1977年   658篇
  1976年   546篇
  1975年   554篇
  1974年   522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.
We report a case of benign lymphoplasmacytic plaque (LPP) in a child. These asymptomatic erythematous papulonodular lesions are an emerging clinicopathological entity. Herein, we describe a previously unreported site for LPP lesions, namely, the volar wrist and the distal ipsilateral palm.  相似文献   
6.

Objectives

To determine: (i) the behaviour change techniques used by a sample of Australian physiotherapists to promote non-treatment physical activity; and (ii) whether those behaviour change techniques are different to the techniques used to encourage adherence to rehabilitation exercises.

Design

Cross-sectional survey.

Method

An online self-report survey was advertised to private practice and outpatient physiotherapists treating patients with musculoskeletal conditions. The use of 50 behaviour change techniques were measured using five-point Likert-type scale questions.

Results

Four-hundred and eighty-six physiotherapists responded to the survey, with 216 surveys fully completed. Most respondents (85.1%) promoted non-treatment physical activity often or all of the time. Respondents frequently used 29 behaviour change techniques to promote non-treatment physical activity or encourage adherence to rehabilitation exercises. A similar number of behaviour change techniques was frequently used to encourage adherence to rehabilitation exercises (n = 28) and promote non-treatment physical activity (n = 26). Half of the behaviour change techniques included in the survey were frequently used for both promoting non-treatment physical activity and encouraging adherence to rehabilitation exercises (n = 25). Graded tasks was the most, and punishment was the least, frequently reported technique used to promote non-treatment physical activity and encourage adherence to rehabilitation exercises.

Conclusions

Respondents reported using similar behaviour change techniques to promote non-treatment physical activity and encourage adherence to rehabilitation exercises. The variability in behaviour change technique use suggests the behaviour the physiotherapist is promoting influences their behaviour change technique choice. Including the frequently-used behaviour change techniques in non-treatment physical activity promotion interventions might improve their efficacy.  相似文献   
7.
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