1. 2nd Department of Internal Medicine and Research Laboratory, Medical School National & Kapodistrian University of Athens, Hippokration Hospital Athens Greece
2. Gastroenterology Department National & Kapodistrian University of Athens, Medical School, Laiko General Hospital Athens Greece
3. Gastroenterology Department Alexandra Hospital Athens Greece
4. Department of Nutrition and Dietetics, School of Health Sciences & Education Harokopio University of Athens Athens Greece