全文获取类型
收费全文 | 83677篇 |
免费 | 10440篇 |
国内免费 | 456篇 |
专业分类
耳鼻咽喉 | 1250篇 |
儿科学 | 2208篇 |
妇产科学 | 2226篇 |
基础医学 | 8121篇 |
口腔科学 | 4139篇 |
临床医学 | 10451篇 |
内科学 | 19283篇 |
皮肤病学 | 1259篇 |
神经病学 | 6773篇 |
特种医学 | 2886篇 |
外国民族医学 | 2篇 |
外科学 | 13413篇 |
综合类 | 1062篇 |
现状与发展 | 13篇 |
一般理论 | 103篇 |
预防医学 | 7899篇 |
眼科学 | 2169篇 |
药学 | 4607篇 |
中国医学 | 145篇 |
肿瘤学 | 6564篇 |
出版年
2023年 | 1369篇 |
2022年 | 807篇 |
2021年 | 1752篇 |
2020年 | 1906篇 |
2019年 | 1471篇 |
2018年 | 2534篇 |
2017年 | 2106篇 |
2016年 | 2439篇 |
2015年 | 2669篇 |
2014年 | 3685篇 |
2013年 | 5106篇 |
2012年 | 4510篇 |
2011年 | 4815篇 |
2010年 | 3664篇 |
2009年 | 4099篇 |
2008年 | 4723篇 |
2007年 | 4662篇 |
2006年 | 4637篇 |
2005年 | 4551篇 |
2004年 | 4144篇 |
2003年 | 3727篇 |
2002年 | 3654篇 |
2001年 | 1101篇 |
2000年 | 888篇 |
1999年 | 1092篇 |
1998年 | 1230篇 |
1997年 | 1084篇 |
1996年 | 1012篇 |
1995年 | 873篇 |
1994年 | 757篇 |
1993年 | 693篇 |
1992年 | 701篇 |
1991年 | 658篇 |
1990年 | 548篇 |
1989年 | 576篇 |
1988年 | 516篇 |
1987年 | 492篇 |
1986年 | 452篇 |
1985年 | 509篇 |
1984年 | 506篇 |
1983年 | 483篇 |
1982年 | 609篇 |
1981年 | 510篇 |
1980年 | 530篇 |
1979年 | 333篇 |
1978年 | 353篇 |
1977年 | 364篇 |
1976年 | 291篇 |
1975年 | 314篇 |
1974年 | 269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.
Rajendrababu Sharmila Puthuran George Varghese Alia Laxmi Ananya Uduman Mohammed Sithiq Wijesinghe Hiruni Kaushalya 《International ophthalmology》2022,42(8):2609-2618
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
4.
5.
Maaike van Gerwen MD Naomi Alpert MS Raja Flores MD Emanuela Taioli MD PhD 《American journal of industrial medicine》2020,63(2):115-120
The association between asbestos exposure, mainly in occupational settings, and malignant mesothelioma has been well established; this has prompted several countries to establish mesothelioma epidemiologic surveillance programs often at the request of national agencies. This review compares currently existing mesothelioma registries worldwide to develop a concept model for a US real-time case capture mesothelioma registry. Five countries were identified with a mesothelioma specific registry, including Italy, France, UK, Australia, and South Korea. All, except the UK, used interviews to collect exposure data. Linkage with the national death index was available or was in future plans for all registries. The registries have limited information on treatment, quality of life, and other patient-centered outcomes such as symptoms and pain management. To thoroughly collect exposure data, “real-time” enrollment is preferable; to maximize the capture of mesothelioma cases, optimal coverage, and a simplified consent process are needed. 相似文献
6.
7.
Chie Teramoto PHN RN MS Satoko Nagata PhD PHN RN Reiko Okamoto PhD PHN RN Ruriko Suzuki PHN RN MS Emiko Kishi PhD PHN RN Michie Nomura DSN PHN RN Noriko Jojima PHN RN MS Masumi Nishida PhD PHN RN Keiko Koide PhD PHN RN Emiko Kusano PhD PHN RN Saori Iwamoto PhD PHN RN Sachiyo Murashima PhD PHN RN 《Public health nursing (Boston, Mass.)》2015,32(6):654-661
8.
9.
10.