1. Rheumatology Unit, ERN‐ReCONNET Center Meyer Children Hospital IRCCS Florence Italy
2. Gastroenterology and Nutrition Unit Meyer Children Hospital IRCCS Florence Italy
3. NEUROFARBA Department University of Florence Florence Italy
4. Pediatric Gastroenterology and Liver Unit Sapienza University of Rome Rome Italy
5. Pediatric Gastroenterology Unit, Pediatrics Department Maggiore C.A. Pizzardi Hospital Bologna Italy
6. Pediatric Hepatology Gastroenterology and Transplantation Unit ASST Papa Giovanni XXIII Bergamo Italy
7. Department of Pediatrics, Vittore Buzzi Children's Hospital University of Milan Milan Italy
8. Department of Pediatrics Fondazione IRCCS San Gerardo dei Tintori Monza Italy