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; Italian SITIP-SIP Pediatric Infection Study Group; Italian SITIP-SIP SARS-CoV-2 paediatric infection study group* (Euro Surveill, 2020)