1. Department of Gastroenterology, General Hospital of Athens “Evaggelismos”, Athens, Greece
2. Medical Department, AbbVie Pharmaceuticals S.A., Athens, Greece
3. Department of Gastroenterology, General Hospital of Heraklion “Venizeleio-Pananeio”, Heraklion, Crete, Greece
4. Department of Gastroenterology, University Hospital of Heraklion, Crete, Greece
5. Department of Gastroenterology, Pathology Unit, University General Hospital of Ioannina, Ioannina, Greece
6. Department of Gastroenterology, General Hospital of Piraeus “Tzaneio”, Piraeus, Greece
7. Department of Gastroenterology, General Hospital of Nikaia & Piraeus “Agios Panteleimon”-General Hospital Dytikis Attikis “Agia Varvara”, Nikaia, Greece
8. Department of Gastroenterology, Pathology Unit, General Hospital of Athens “Alexandra”, Athens, Greece
9. Department of Gastroenterology-Oncology, Pathology Unit, Anticancer Hospital of Thessaloniki “Theageneio”, Thessaloniki, Greece
10. Department of Gastroenterology, Pathology Unit, General Hospital of Thessaloniki “G. Papanikolaou”, Thessaloniki, Greece