收费全文 | 3285篇 |
免费 | 221篇 |
国内免费 | 21篇 |
耳鼻咽喉 | 18篇 |
儿科学 | 107篇 |
妇产科学 | 51篇 |
基础医学 | 559篇 |
口腔科学 | 58篇 |
临床医学 | 267篇 |
内科学 | 649篇 |
皮肤病学 | 53篇 |
神经病学 | 410篇 |
特种医学 | 48篇 |
外科学 | 434篇 |
综合类 | 24篇 |
一般理论 | 7篇 |
预防医学 | 390篇 |
眼科学 | 50篇 |
药学 | 146篇 |
中国医学 | 5篇 |
肿瘤学 | 251篇 |
2023年 | 53篇 |
2022年 | 84篇 |
2021年 | 130篇 |
2020年 | 78篇 |
2019年 | 96篇 |
2018年 | 97篇 |
2017年 | 74篇 |
2016年 | 84篇 |
2015年 | 116篇 |
2014年 | 145篇 |
2013年 | 195篇 |
2012年 | 252篇 |
2011年 | 285篇 |
2010年 | 148篇 |
2009年 | 140篇 |
2008年 | 189篇 |
2007年 | 190篇 |
2006年 | 221篇 |
2005年 | 208篇 |
2004年 | 192篇 |
2003年 | 154篇 |
2002年 | 133篇 |
2001年 | 13篇 |
1999年 | 14篇 |
1998年 | 24篇 |
1997年 | 14篇 |
1996年 | 18篇 |
1995年 | 15篇 |
1994年 | 17篇 |
1993年 | 14篇 |
1992年 | 9篇 |
1991年 | 7篇 |
1990年 | 3篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 4篇 |
1984年 | 8篇 |
1983年 | 5篇 |
1982年 | 6篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1978年 | 6篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1975年 | 3篇 |
1972年 | 3篇 |
1965年 | 3篇 |
1945年 | 4篇 |
Background and purpose
Carotid webs are intraluminal filling defects at the carotid bulb which are considered rare, though possibly underappreciated entities with recent studies demonstrating a likely casual association with ischemic stroke. The purpose of the study is to describe our recent experience with clinical and imaging manifestations of carotid webs.Materials and methods
A retrospective review of CTA neck studies in all adult patients presenting to our institution during the 19-month study interval was performed to determine the presence of carotid webs. Subsequent chart review of these patients with webs was performed to assess their clinical history and to obtain demographic detail.Results
A total of 14 patients were identified with carotid webs in the study population. The mean age of patients with webs was 42.1?years (range: 28–54), consisting mostly of African Americans (86%) and females (64%). Ten (71%) of web patients had a history of ischemic stroke, each ipsilateral to the side of web, and at least four of these patients had recurrent ischemic stroke.Conclusion
We provide one of the largest sample sizes of webs gathered in a single study. Given its association with ischemic stroke, carotid webs should be assessed for in all patients presenting with ischemic stroke, especially younger African Americans. 相似文献Previous research suggests that prenatal maternal infections may be associated with increased odds of children having a neurodevelopmental disorder. However, little evidence exists on associations with broader child outcomes, especially subclinical symptoms. Participants were the N = 14,021 members of the population-representative UK Millennium Cohort Study. We examined associations between prenatal maternal infections, both maternal-reported and hospital-recorded, and children’s socioemotional development, using the Strengths and Difficulties Questionnaire (SDQ) at age three. Maternal-reported prenatal infections were associated with increased emotional symptoms, after adjusting for several potential confounds and covariates. Hospital-recorded prenatal infections were not associated with children’s socioemotional outcomes, after adjusting for potential confounding and covarying factors. Findings suggest that prenatal maternal infections, particularly those which the mothers remember months later, may be associated with increased emotional problems in early childhood. This emphasises the need for screening for and preventing infections during pregnancy. Further, the occurrence of prenatal infection indicates the potential need for early intervention for children’s emotional difficulties.
相似文献- Download : Download high-res image (252KB)
- Download : Download full-size image