1. Gastroenterology and Endoscopy Unit, ARNAS Civico Di Cristina Benfratelli Hospital, Palermo, Italy
2. Department of Health Promotion, Maternal and Infant Care, Internal Medicine and Medical Specialties, University of Palermo, Palermo, Italy
3. Division of Pediatric Infectious Diseases, “G. Di Cristina” Hospital, ARNAS Civico Di Cristina Benfratelli Hospital, Palermo, Italy