1. Department of Radiology, Bambino Gesù Children's Hospital, Rome, Italy.
2. Department of Interventional Radiology, Raigmore Hospital, NHS Highland, Old Perth Rd, Inverness IV2 3UJ, UK.
3. Unit of Gastroenterology, Hepatology and Nutrition, Bambino Gesù Children's Hospital, Rome, Italy.
4. Department of Surgery, Transplantation Service, A. Gemelli Hospital, Catholic University, Rome, Italy.
5. Department of Pathology, Bambino Gesù Children's Hospital, Rome, Italy.
6. Department of Abdominal Transplantation and Hepatobiliary and Pancreatic Surgery, Bambino Gesù Children's Hospital, Rome, Italy.