1. Gastroenterology Department, Sismanogleio General Hospital, Marousi, Greece
2. Hellenic Society of Gastrointestinal Oncology
3. School of Science and Technology, Hellenic Open University, Patras, Greece
4. Department of Quality Control, Research and Continuing Education, Sismanogleio General Hospital, Marousi, Greece
5. Pathology Department, Sismanogleio General Hospital, Marousi, Greece
6. Special Unit for Biomedical Research and Education, School of Medicine, Aristotle University of Thessaloniki, Greece
7. 2nd Gastroenterology Department, Hygeia Hospital, Athens, Greece
8. Administration, Sismanogleio General Hospital, Marousi, Greece
9. Department of Gastroenterology, University of Crete Medical School, Heraklion, Greece