[1] Bambino Gesu Pediat Hosp, Rome, Italy
[2] Fdn Policlin A Gemelli, Dept Life Sci & Publ Hlth, IRCCS, Rome, Italy
[3] Univ Cattolica Sacro Cuore, Rome, Italy
[4] ASST Gaetano Pini CTO, Pediat Rheumatol, Milan, Italy
[5] Univ Milan, Milan, Italy
[6] Univ Genoa, Pediat & Rheumatol Unit, Ist Giannina Gaslini, IRCCS, Genoa, Italy
[7] Ist Giannina Gaslini, IRCCS, Genoa, Italy
[8] AOU Policlin Giovanni XXIII, Dept Pediat, Bari, Italy
[9] Univ Brescia, Pediat Clin, ASST Spedali Civili Brescia, Brescia, Italy
[10] Fdn IRCCS Ca Granda Osped Maggiore Policlin, UOC Pediat, UOS Pediat Immunol, Milan, Italy
[11] Fdn IRCCS Ca Granda Osped Maggiore Policlin, Sect Pediat Cardiovasc Dis, Milan, Italy
[12] Univ Trieste, Trieste, Italy
[13] IRCCS Burlo Garofolo, Inst Child & Maternal Hlth, Trieste, Italy
[14] S Eugenio Hosp, UOC Pediat, Rome, Italy
[15] Univ Palermo, Palermo, Italy