Mameli C, Picca M, Buzzetti R, Pace ME, Badolato R, Cravidi C, Zuccotti GV, Marchisio P for the Italian Society of Paediatrics Lombardy Section. Incidence of acute respiratory infections in preschool children in an outpatient setting before and during Covid-19 pandemic in Lombardy Region, Italy. Italian Journal of Pediatrics, 2022;48:https://doi.org/10.1186/s13052-022-01221-w-