1. Department of Medicine, Surgery and Dentistry “Scuola Medica Salernitana”, Università di Salerno, Baronissi (Salerno), Italy
2. Department of Pediatric Dermatology, Santobono-Pausilipon Children Hospital, Naples, Italy
3. Department of Pediatrics, Santobono-Pausilipon Children Hospital, Naples, Italy
4. Liver Unit, Liver Transplant Program, Bambino Gesù Children Hospital, Rome, Italy.