Corrigendum: Age-Related Differences in the Expression of Most Relevant Mediators of SARS-CoV-2 Infection in Human Respiratory and Gastrointestinal Tract - Roberto Berni Canani; Roberto Berni Canani; Roberto Berni Canani; Roberto Berni Canani; Marika Comegna; Marika Comegna; Lorella Paparo; Lorella Paparo; Gustavo Cernera; Gustavo Cernera; Cristina Bruno; Cristina Bruno; et al. (Frontiers Media S.A., 2021)