1. Gastroenterology Unit, Department of Internal Medicine University of Genoa Genoa Italy
2. IRCCS Ospedale Policlinico San Martino Genoa Italy
3. Unit of Otolaryngology, ASL 4 Liguria Hospital of Lavagna Genoa Italy
4. Unit of Otolaryngology, Head and Neck Surgery IRCCS Ospedale Policlinico San Martino Genoa Italy
5. Department of Surgical Sciences and Integrated Diagnostics (DISC) University of Genoa Genoa Italy
6. Department of Surgery, Oncology and Gastroenterology University of Padua Padua Italy
7. Gastroenterology Unit Azienda Ospedale Università of Padua Padua Italy