A three-part model for the self-controlled case series design to estimate and characterize adverse event risk in an overlapping risk period after multiple vaccines: application to ischemic stroke following Pfizer-BioNTech bivalent COVID-19 vaccine and influenza vaccine. - Xu S; Sy LS; Huang X; Hong V; Han B; Bruxvoort KJ; Lewin B; Holmquist KJ; Qian L (American journal of epidemiology, 2026)