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Prevalence  of anti-SARS-CoV-2 antibodies in the general population in Belgium : Results of the second data collection (28/09/21-23/02/22), Van den Houte, Nayema, Leclercq V, Gisle Lydia, and Van der Heyden Johan , 21/04/2022, Brussels, Belgium, p.13, (2022)\par \par }