欧洲疾控中心：2025年使用健康数据注册的新冠肺炎疫苗有效性多国研究（VEBIS）协议报告-3.0版本（英文版）

The proposed study design is a multicentre retrospective cohort design using data collected routinely from electronic health record (EHR) databases. The analysis included data from the resident community-dwelling population (i.e. excluding those living in nursing homes) ≥65 years of age and who belong to age-group for whom vaccination has been universally recommended at study enrolment (i.e. if vaccination with a booster was only recommended for individuals ≥80 years of age at a given month,