The Impact of Prior Season Vaccination on Subsequent Influenza Vaccine Effectiveness to Prevent Influenza-related Hospitalizations Over 4 Influenza Seasons in Canada. - Nichols, M K; Andrew, M K; Ye, L; Hatchette, T F; Ambrose, A; Boivin, G; Bowie, W; Santos, G Dos; Elsherif, M; Green, K; Haguinet, F; Katz, K; et al. (Clinical Infectious Diseases, 2019)