Comparing the incidence of SARS-CoV-2 across age groups considering sampling biases - use of testing data of autumn 2021 in BelgiumAbstractBackgroundMethodsResultsConclusion, Lajot, Adrien, Cornelissen Laura, Van Cauteren Dieter, Meurisse Marjan, Brondeel Ruben, and Dupont-Gillain Christine , Archives of Public Health, Jan-12-2023, Volume 81, Issue 1, (2023)