[1] Univ Trieste, Piazzale Europa 2, I-34100 Trieste, Italy
[2] Inst Maternal & Child Hlth IRCCS, Burlo Garofolo Via Istria 65-1, I-34100 Trieste, Italy
[3] Univ Florence, Rheumatol Unit, Anna Meyer Childrens Hosp, Viale Piefaccini 24, I-50139 Florence, Italy