1. Clinic of Nephrology and Renal Transplantation, Medical School of Athens, National and Kapodistrian University, Laiko General Hospital, 11527 Athens, Greece
2. Immunology Department and National Tissue Typing Center, General Hospital of Athens, ‘Georgios Gennimatas’, 11527 Athens, Greece
3. 1st Department of Pathology, Medical School of Athens, National and Kapodistrian University, Laiko General Hospital, 11527 Athens, Greece