Determinants of adherence to COVID-19 measures among the Belgian population: an application of the protection motivation theory., Van Loenhout, Joris, Vanderplanken Kirsten, Scheen Bénédicte, Van den Broucke Stephan, and Aujoulat Isabelle , Arch Public Health, 2021 May 12, Volume 79, Issue 1, (2021)