[1] IRCCS Ist Ortoped Rizzoli, Unit Pediat Orthopaed & Traumatol, Via Pupilli 1, I-40136 Bologna, Italy
[2] Cesare Arrigo Childrens Hosp, Orthopaed & Traumatol Unit, Alessandria, Italy
[3] Campolongo Hosp, Unit Pediat Orthopaed & Traumatol, Eboli, SA, Italy
[4] Univ Bari, Unit Pediat Orthopaed & Traumatol, Giovanni XXIII Childrens Hosp, Bari, Italy
[5] Univ Roma Tor Vergata, Dept Orthopaed Surg, Rome, Italy
[6] Padua Hosp, Dept Woman & Child Hlth, Pediat Orthopaed Unit, Padua, Italy
[7] Azienda Osped Rilievo Nazl Santobono Pausillipon, Unit Pediat Orthopaed & Traumatol, Naples, Italy
[8] IRCCS Ist Giannina Gaslini, Unit Pediat Orthopaed & Traumatol, Genoa, Italy
[9] Ctr Specialist Ortoped Traumatol Gaetano Pini CTO, Dept Paediat Orthopaed & Traumatol, Pzza A Ferrari 1, I-20122 Milan, Italy
[10] IRCCS Bambino Gesu Paediat Hosp, Unit Pediat Orthopaed & Traumatol, Rome, Italy
[11] IRCCS Ist Galeazzi, Unit Pediat Orthopaed & Traumatol, Milan, Italy