[1] Univ Padua, Dept Cardiac Thorac Vasc Sci & Publ Hlth, Unit Biostat Epidemiol & Publ Hlth, Padua, Italy
[2] Univ Florence, Giuseppe Parenti Dept Stat Comp Sci Applicat, Florence, Italy
[3] Univ Turin, Dept Sci Publ Hlth & Pediat, Turin, Italy
[4] Univ Hosp Verona, Verona, Italy
[5] S Bortolo Hosp, Vicenza, Italy
[6] Salesi Childrens Hosp, Ancona, Italy
[7] IRCCS Giannina Gaslini Children Hosp, Genoa, Italy
[8] Univ Hosp Messina, Messina, Italy
[9] S Orsola Malpighi IRCCS Univ Hosp, Bologna, Italy
[10] Buzzi Childrens Hosp, Milan, Italy
[11] IRCCS Burlo Garofalo, Trieste, Italy
[12] Di Cristina Childrens Hosp, Palermo, Italy
[13] Santobono Hosp, Naples, Italy
[14] Bambino Gesu Pediat Hosp, ARCO Unit, Rome, Italy
[15] Bambino Gesu Pediat Hosp, DEA Unit, Rome, Italy
[16] Meyer Childrens Hosp Florence, Florence, Italy
[17] Spedali Civil Brescia, Brescia, Italy
[18] AOU Citta Salute & Sci, Turin, Italy
[19] Papa Giovanni XXXIII Hosp, Bergamo, Italy
[20] Policlin Univ Hosp Catania, Catania, Italy
[21] Univ Hosp Padua, Padua, Italy