1. Department of Gastroenterology, Sismanogleio‑Amalia Flemig General Hospital, 15126 Athens, Greece
2. Department of Histopathology, Sismanogleio‑Amalia Flemig General Hospital, 15126 Athens, Greece
3. Department of Epidemiology and Biostatistics, National School of Public Health, 11521 Athens, Greece
4. Department of Gastroenterology, Metropolitan General, Hellenic Society of Gastrointestinal Oncology, 15562 Athens, Greece
5. Experimental, Educational and Research Center, ELPEN Laboratories, Hellenic Society of Gastrointestinal Oncology, 19009 Athens, Greece