全文获取类型
收费全文 | 1331513篇 |
免费 | 98161篇 |
国内免费 | 2285篇 |
专业分类
耳鼻咽喉 | 18733篇 |
儿科学 | 43685篇 |
妇产科学 | 39111篇 |
基础医学 | 193978篇 |
口腔科学 | 36831篇 |
临床医学 | 113719篇 |
内科学 | 264057篇 |
皮肤病学 | 27227篇 |
神经病学 | 103661篇 |
特种医学 | 51706篇 |
外国民族医学 | 368篇 |
外科学 | 206255篇 |
综合类 | 27446篇 |
现状与发展 | 2篇 |
一般理论 | 403篇 |
预防医学 | 97376篇 |
眼科学 | 30720篇 |
药学 | 101700篇 |
1篇 | |
中国医学 | 2623篇 |
肿瘤学 | 72357篇 |
出版年
2018年 | 12893篇 |
2016年 | 10917篇 |
2015年 | 12626篇 |
2014年 | 17574篇 |
2013年 | 26900篇 |
2012年 | 36893篇 |
2011年 | 39587篇 |
2010年 | 23323篇 |
2009年 | 21949篇 |
2008年 | 38552篇 |
2007年 | 41684篇 |
2006年 | 42053篇 |
2005年 | 41440篇 |
2004年 | 39798篇 |
2003年 | 38467篇 |
2002年 | 37949篇 |
2001年 | 58713篇 |
2000年 | 60108篇 |
1999年 | 51312篇 |
1998年 | 14903篇 |
1997年 | 13358篇 |
1996年 | 13515篇 |
1995年 | 12772篇 |
1994年 | 12177篇 |
1993年 | 11242篇 |
1992年 | 41438篇 |
1991年 | 40772篇 |
1990年 | 40242篇 |
1989年 | 39083篇 |
1988年 | 36451篇 |
1987年 | 35666篇 |
1986年 | 34025篇 |
1985年 | 32492篇 |
1984年 | 24300篇 |
1983年 | 21170篇 |
1982年 | 12851篇 |
1981年 | 11337篇 |
1980年 | 10636篇 |
1979年 | 22903篇 |
1978年 | 16175篇 |
1977年 | 14019篇 |
1976年 | 13202篇 |
1975年 | 14467篇 |
1974年 | 16911篇 |
1973年 | 16269篇 |
1972年 | 15478篇 |
1971年 | 14324篇 |
1970年 | 13335篇 |
1969年 | 12825篇 |
1968年 | 12051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.
Kara S. Tanaka MD Veronica R. Andaya BA Steven W. Thorpe MD Kenneth R. Gundle MD James B. Hayden MD Yee-Cheen Duong MD Raffi S. Avedian MD David G. Mohler MD Lee J. Morse MD Melissa N. Zimel MD Richard J. O'Donnell MD Andrew Fang MD Robert Lor Randall MD Tina H. Tran BS Christin New BA Rosanna L. Wustrack MD other members of Study Group FORCE 《Journal of surgical oncology》2023,127(1):148-158
6.
Timothy J. Cordingley Mark A.G. Wilson Kathryn M. Weston 《Health & social care in the community》2022,30(1):353-359
Vaccination is a vital health care initiative to prevent individual and population infection. To increase vaccination rates the federal government implemented the ‘No Jab, No Pay’ policy, where eligibility for several government benefits required children to be fully vaccinated by removing ‘conscientious objections’ and expanding the age range of children whose families receive benefits. This study assesses the impact of this policy at a local area within a single medical practice community in NSW, Australia. A retrospective clinical audit was performed between 2012 and 2017 on a single general practice's vaccination records for children ≤19 years. Catch-up vaccinations were assessed based on age at vaccination. Incidence of catch-up vaccinations was assessed for each of four years before and two years after the implementation of the ‘No Jab, No Pay’ policy in January 2016, along with the age of children and vaccination(s) given. Catch-up vaccinations were assessed temporally either side of implementation of ‘No Jab, No Pay’. Comparing the average annual vaccination catch-up incidence rate of 6.2% pre-implementation (2012–2015), there was an increase to 9.2% in 2016 (p < .001) and 7.8% in 2017 (p = .027). Secondary outcome measurement of catch-up vaccination incidence rates before (2012–2015) and after (2016–2017) ‘No Jab, No Pay’ implementation showed statistically significant increases for children aged 8–11 years (3.2%–5.6%, p = .038), 12–15 years (7.5%–14.7%, p < .001) and 16–19 years (3.3%–10.2%, p < .001) along with a statistically significant reduction in children aged 1–3 years (11.4%–6.2%, p = .015). Also, catch-up rates for DTPa significantly increased after program implementation. This study demonstrates that the Australian federal government vaccination policy ‘No Jab, No Pay’ was coincident with an increase in catch-up vaccinations within a rural NSW community served by one medical practice, especially for older children. 相似文献
7.
8.
9.
Madan M. Rehani Emily R. Melick Raza M. Alvi Ruhani Doda Khera Salma Batool-Anwar Tomas G. Neilan Michael Bettmann 《European radiology》2020,30(4):1839-1846
To determine percent of patients without malignancy and ≤ 40 years of age with high cumulative radiation doses through recurrent CT exams and assess imaging appropriateness. From the cohort of patients who received cumulative effective dose (CED) of ≥ 100 mSv over a 5-year period, a sub-set was identified with non-malignant disease. The top 50 clinical indications leading to multiple CTs were determined. Clinical decision support (CDS) system scores were analyzed using a widely adopted standard of 1–3 (red) as “not usually appropriate,” 4–6 (yellow) “may or may not be appropriate,” and 7–9 (green) “usually appropriate.” Clinicians reviewed patient records to assess compliance with appropriate use criteria (AUC). 9.6% of patients in our series were with non-malignant conditions and 1.4% with age ≤ 40 years. CDS scores (rounded) were 2% red, 38% yellow, 27% green, and 33% unscored CTs. Clinical society guidelines for CT exams, wherever available, were followed in 87.5 to 100% of cases. AUCs were not available for several clinical indications as also referral guidelines for serial CT imaging. More than half of CT exams were unrelated to follow-up of a primary chronic disease. We are faced with a situation wherein patients in age ≤ 40 years require or are thought to require many CT exams over the course of a few years but the radiation risk creates concern. There is a fair number of conditions for which AUC are not available. Suggested solutions include development of CT scanners with lesser radiation dose and further development of appropriateness criteria. 相似文献