1. Inflammatory Bowel Disease Unit, A.O.O.R. ‘Villa Sofia-Cervello’, Palermo, Italy
2. Inflammatory Bowel Disease Unit, A.O.U. Policlinico ‘G. Martino’, Messina, Italy
3. Inflammatory Bowel Disease Unit, A.O. ‘Cannizzaro’, Catania, Italy
4. Gastroenterology and Hepatology Unit, A.O.U. Policlinico ‘G. Giaccone’, Palermo, Italy
5. Gastroenterology Unit, A.R.N.A.S. ‘Garibaldi’, Catania, Italy
6. Internal Medicine Unit, A.O.U. Policlinico ‘Vittorio Emanuele’, Catania, Italy
7. Gastroenterology Unit, A.O.U. Policlinico ‘Vittorio Emanuele’, Catania, Italy
8. Gastroenterology and Endoscopy Unit, A.R.N.A.S. ‘Civico Di Cristina Benfratelli’, Palermo, Italy
9. Gastroenterology Unit, A.O. ‘Guzzardi’, Vittoria, Italy
10. Gastroenterology Unit, A.O.O.R. ‘S. Elia- M. Raimondi’, Caltanissetta, Italy
11. Gastroenterology Unit, A.O. ‘Santa Marta e S. Venera’, Acireale, Italy
12. Surgery Unit, A.O. ‘Umberto I’, Siracusa, Italy
13. Internal Medicine Unit, A.O. ‘Giovanni Paolo II’, Sciacca, Italy
14. Gastroenterology and Endoscopy Unit, A.O. ‘S. Antonio Abate’, Trapani, Italy
15. Gastroenterology Unit, A.O.O.R. ‘Papardo Piemonte’, Messina, Italy
16. Gastroenterology and Endoscopy Unit, A.O. ‘Buccheri La Ferla Fatebenefratelli’, Palermo, Italy
17. Pediatric Gastroenterology Unit, A.O.U. Policlinico ‘G. Martino’, Messina, Italy
18. Pediatric Unit, A.O.O.R. ‘Villa Sofia-Cervello’, Palermo, Italy
19. Pediatric Unit, A.O.U. Policlinico ‘G. Giaccone’, Palermo, Italy