1. Pediatric Gastroenterology and Liver Unit, Department of Maternal Infantile and Urological Sciences, Sapienza University of Rome , Rome , Italy
2. Hepatogastroenterology, Nutrition, Digestive Endoscopy and Liver Transplant Unit, Bambino Gesù Children’s Hospital, IRCCS , Rome , Italy
3. IBD Unit, IRCCS, Azienda Ospedaliero-Universitaria di Bologna , Italy
4. Alma Mater Studiorum, Università di Bologna , Italy
5. Pediatric Gastroenterology Unit, Maggiore Hospital , Largo Bartolo Nigrisoli, 2, 40133 Bologna , Italy
6. Department of Pathophysiology and Transplantation, University of Milan , Italy
7. Division of Gastroenterology and Endoscopy, Foundation IRCCS Ca’ Granda Ospedale Maggiore
8. Division of Gastroenterology and Endoscopy, Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico , Milan , Italy