Incidence of acute respiratory infections in preschool children in an outpatient setting before and during Covid-19 pandemic in Lombardy Region, Italy. - Mameli, Chiara; Picca, Marina; Buzzetti, Roberto; Pace, Maria Elisabetta; Badolato, Raffaele; Cravidi, Claudio; Zuccotti, Gian Vincenzo; Marchisio, Paola; for the Italian Society of Paediatrics Lombardy Section; Sala, Marco; Di Cosimo, Maria Elisabetta (Italian Journal of Pediatrics, 2022)