[1] Santobono Pausilipon Childrens Hosp, Pediat Gastroenterol & Hepatol Unit, Via Mario Fiore 6, I-80129 Naples, Italy
[2] Garbagnate Milanese Hosp, Gastroenterol & Endoscopy Unit, Milan, Italy
[3] Sapienza Univ Rome, NESMOS Dept, Pediat Unit, Rome, Italy
[4] Univ Campania Luigi Vanvitelli, Dept Precis Med, Hepatogastroenterol Div, Naples, Italy