1. Department of Nephrology, 1st Department of Internal Medicine, AHEPA Hospital, Faculty of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
2. Medical School, University of Thessaly, Larissa, and Peritoneal Dialysis Unit, 1st Department of Internal Medicine, AHEPA Hospital, Faculty of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece