1. 1st Department of Pathology Medical School; National and Kapodistrian University of Athens; Athens; Greece
2. Department of Nephrology and Renal Transplantation Unit; Laiko Hospital; Athens; Greece
3. Gastroenterology Division; 1st Department of Internal Medicine, Propaedeutic; Medical School; University of Athens; Athens; Greece
4. Molecular Carcinogenesis Group; Department of Histology and Embryology; School of Medicine; University of Athens; Athens; Greece