1. Department of Nephrology (P.S.), Aristotle University of Thessaloniki, Greece.
2. Third Department of Cardiology (C.E.P.), Aristotle University of Thessaloniki, Greece.
3. Hippokration Hospital and First Department of Cardiology, AHEPA Hospital (V.K., G.G.), Aristotle University of Thessaloniki, Greece.
4. Second Propaedeutic Department of Internal Medicine (M.D.), Aristotle University of Thessaloniki, Greece.