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Seroprevalence of SARS-CoV-2 antibodies in school aged children in two regions with difference in prevalence of COVID-19 disease: Interim report, Vandermeulen, Corinne, Boey Lise, Desombere I, Duysburgh Els, Merckx Joanna, and Roelants Mathieu , 2020, Brussels, Belgium, (2020)\par \par }