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Prevalence and incidence of anti-SARS-CoV-2 antibodies among healthcare workers in Belgian hospitals before vaccination: a prospective cohort study., Mortgat, Laure, Verdonck Kristien, Hutse Veronik, Thomas Isabelle, Barbezange Cyril, Heyndrickx Leo, Fischer Nathalie, Vuylsteke Bea, Kabouche Ines, Ari\'ebn Kevin K., et al. , BMJ Open, 2021 06 29, Volume 11, Issue 6, (2021)\par \par }