[1] Univ Messina, Dept Human Pathol Adulthood & Childhood G Barresi, Pediat Gastroenterol & Cyst Fibrosis Unit, Messina, Italy
[2] Womans & Childrens Univ Hosp Verona, Dept Pediat, I-37126 Verona, Italy
[3] Hosp Papa Giovanni XXIII, Pediat Hepatol Gastroenterol & Transplantat, Bergamo, Italy
[4] Sapienza Univ Rome, Maternal & Child Hlth Dept, Pediat Gastroenterol & Liver Unit, Rome, Italy
[5] Univ Insubria, F Del Ponte Hosp, Dept Pediat, Varese, Italy
[6] Univ Campania Vanvitelli, Dept Woman Child & Gen & Specialist Surg, Naples, Italy
[7] Bambino Gesu Pediat Hosp, Dept Gastroenterol Hepatol & Nutr, Digest Endoscopy Unit, Rome, Italy
[8] Univ Florence, Meyer Childrens Hosp, Dept NEUROFARBA, Gastroenterol & Nutr Unit, Florence, Italy