1 Digestive Endoscopy and Surgery, Gastroenterology and Nutrition, Bambino Gesù Children's Hospital IRCCS, Bambino Gesù Children's Hospital IRCCS, Rome, Italy.
2 Department of Medical and Surgical Science, Hepatobiliopancreatic Surgery, Liver and Kidney Transplanation, Pediatric Clinic, University of Perugia, Perugia, Italy.
3 Dipartimento di Medicina, Chirurgia e Odontoiatria "Scuola Medica Salernitana", Section of Pediatrics, Baronissi, Italy.
4 Department of Pediatric Hematology, Oncology and Transplant Unit, IRCCS Ospedale Pediatrico Bambino Gesù, Rome, Italy.
5 Unit of Hepato-Biliary-Pancreatic Surgery, Liver and Kidney Transplantation, Bambino Gesù Children's Hospital IRCCS, Rome, Italy.