Italian SITIP-SIP SARS-CoV-2 paediatric infection study group. Multicentre Italian study of SARS-CoV-2 infection in children and adolescents, preliminary data as at 10 April 2020 - Garazzino, S; Montagnani, C; Donà, D; Meini, A; Felici, E; Vergine, G (Euro Surveill, 2020)