1. Children's Hospital, Istituto Mediterraneo di Eccellenza Pediatrica, Pediatric Surgery Unit, Palermo, Italy
2. Pediatric Unit, University of Pavia and Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
3. Department of Radiology, Studio Diagnostico Eco, Vimercate, Milan, Italy
4. University of Trieste, Institute of Pathologic Anatomy, Trieste, Italy
5. School of Medicine and Surgery, University of Milano, Milan, Italy
6. Fondazione IRCCS Policlinico San Matteo, Scientific Direction, Biometry & Clinical Epidemiology, Pavia, Italy
7. Department of Radiology, Cattinara Hospital, Trieste, Italy
8. Hôpitaux Pédiatriques de Nice CHU-Lenval, Nice, France