1. Department of Paediatric Surgery, Spedali Civili Children’s Hospital, Brescia, Italy
2. Department of Urology, Policlinico Umberto I, Sapienza University, Rome, Italy
3. Department of Emergency Radiology, S. Camillo-Forlanini Hospital, Rome, Italy
4. Department of Paediatric Surgery, S. Camillo-Forlanini Hospital, Rome, Italy