1. Division of Nephrology and Hypertension, 1st Department of Internal Medicine; AHEPA Hospital, School of Medicine, Aristotle University of Thessaloniki; Thessaloniki Greece
2. Clinic of Nephrology and Hypertension, Diabetes and Endocrinology; Otto-von-Guericke University; Magdeburg Germany
3. Department of Physiology, Faculty of Medicine; University of Thessaly; Larissa Greece