5 Pediatric Gastroenterology and Endoscopic Unit "Santo Spirito" Hospital, Pescara, Italy.
6 Department of Emergency Radiology, Santobono-Pausilipon Children's Hospital, Naples, Italy.
7 Department of Public Health, University of Naples Federico II, Naples, Italy.
8 NESMOS Department, Chair of Pediatrics, Faculty of Medicine and Psychology, Sapienza University of Rome, Sant'Andrea University Hospital, Rome, Italy.