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Persistence of IgG response to SARS-CoV-2, Duysburgh, Els, Mortgat Laure, Barbezange Cyril, Dierick Katelijne, Fischer Nathalie, Heyndrickx Leo, Hutse Veronik, Thomas Isabelle, Van Gucht Steven, Vuylsteke Bea, et al. , The Lancet Infectious Diseases, Jan-02-2021, Volume 21, Issue 2, (2021)\par \par }