1. Unit of Hepato-Biliary and Transplant Surgery, Department of Surgery and Transplantation Centre, Bambino Gesù Childrens Hospital, Rome, Italy
2. Department of Pathology, Bicêtre Hospital, Le Kremlin-Bicêtre, France
3. Department of Pediatric Radiology, Bicêtre Hospital, Le Kremlin-Bicêtre, France
4. Department of Pediatric Surgery, Bicêtre Hospital, Le Kremlin-Bicêtre, France