1. Pediatric Gastroenterology Unit, Maggiore Hospital, Bologna, Italy
2. Pediatric Gastroenterology Unit, Department of Human Pathology in Adulthood and Childhood “G. Barresi”, University of Messina, Messina, Italy
3. Pediatric Gastroenterology Unit, Institute Giannina Gaslini, Genova, Italy
4. Pediatric Department, Gastroenterology, Digestive Endoscopy and Nutrition Unit, Institute for Maternal and Child Health I.R.C.C.S. Burlo Garofalo, Trieste, Italy
5. Department of Translational Medical Science (Section of Pediatrics), and European Laboratory for the Investigation of Food-Induced Diseases, University Federico II, Naples, Italy
6. Pediatric Gastroenterology and Nutrition Unit, University of Florence-Meyer Hospital, Florence, Italy
7. Pediatric Gastroenterology and Endoscopy Unit, Spirito Santo Hospital, Pescara, Italy
8. Department of Pediatrics and Infantile Neuropsychiatry, Pediatric Gastroenterology and Liver Unit, Sapienza University of Rome, Rome, Italy
9. Hepatology, Gastroenterology and Nutrition Unit, Bambino Gesù Children’s Hospital, Rome, Italy