Factors underlying COVID-19 booster vaccine uptake among fully vaccinated adults in Belgium, Vermeiren, Elias, Hubin Pierre, Nasiadka Léonore, Stouten Veerle, Billuart Matthieu, Van Evercooren Izaak, Catteau Lucy, and Van Loenhout Joris , European Society of Clinical Microbiology and Infectious Diseases, 17/04/2023, Copenhagen, Denmark, (2023)