Factors underlying COVID-19 booster vaccine uptake among adults in Belgium. - Vermeiren, Elias; van Loenhout, Joris A. F.; Nasiadka, Léonore; Stouten, Veerle; Billuart, Matthieu; Van Evercooren, Izaak; Catteau, Lucy; Hubin, Pierre (BMC Research Notes, 2023)