1. Division of Pediatric Surgery, Regina Margherita Children's Hospital, Turin, Italy
2. Department of Pediatric Surgery, Ospedale Infantile Regina Margherita, Turin, Piemonte, Italy
3. Department of Pediatric Surgery, Regina Margherita Children's Hospital, Piazza Polonia, Turin, Italy
4. Department of Paediatric Haematology-Oncology, Ospedale Infantile Regina Margherita, Turin, Piemonte, Italy
5. Department of Anatomo-Pathology, Ospedale Infantile Regina Margherita, Turin, Piemonte, Italy
6. Surgery, Section of Colon and Rectal Surgery, Mayo Clinic Hospital Jacksonville, Jacksonville, Florida, United States
7. Department of Paediatrics, Ospedale SS Annunziata di Savigliano, Savigliano, Piemonte, Italy