1. Pediatric Gastroenterology Unit, Pediatric Department, Maggiore C.A. Pizzardi Hospital , Bologna , Italy
2. Digestive Diseases Unit, Bambino Gesù Children’s Hospital , Rome , Italy
3. Pediatric Gastroenterology and Nutrition Unit, Meyer Children’s Hospital , Florence , Italy
4. Department NEUROFARBA, University of Florence , Florence , Italy
5. Residency School of Pediatrics, University of Bologna , Bologna , Italy
6. Institute for Maternal and Child Health, IRCSS Burlo Garofolo , Trieste , Italy
7. Pediatric Gastroenterology and Endoscopy Unit, S Spirito Hospital , Pescara , Italy
8. Pediatric Gastroenterology and Endoscopy Unit, IRCCS G. Gaslini Children’s Hospital , Genoa , Italy
9. Pediatric Gastroenterology and Cystic Fibrosis Unit, Department of Human Pathology in Adulthood and Childhood G. Barresi, University of Messina , Messina , Italy
10. Pediatric Unit, Fondazione IRCCS San Gerardo dei Tintori Hospital , Monza , Italy
11. Department of Translational Medical Science, Section of Pediatrics, University of Naples Federico II , Naples , Italy
12. Pediatric Gastroenterology and Liver Unit, Sapienza University of Rome , Rome , Italy