Prevalence and incidence of anti-SARS-CoV-2 antibodies among healthcare workers in Belgian hospitals before vaccination: a prospective cohort studyObjectivesDesignSettingParticipantsOutcome measuresResultsConclusionsTrial registration number, Mortgat, Laure, Verdonck Kristien, Hutse Veronik, Thomas Isabelle, Barbezange Cyril, Heyndrickx Leo, Fischer Nathalie, Vuylsteke Bea, Kabouche Ines, Ariën Kevin K., et al. , BMJ Open, May-06-2023, Volume 11, Issue 6, (2021)