1. Endocrinology Clinic (P.A.), Hippokration Hospital, GR-546 42 Thessaloniki, Greece
2. Second Propedeutic Department of Internal Medicine (V.G.A., A.K.), Medical School, Aristotle University of Thessaloniki, Hippokration Hospital, GR-546 42 Thessaloniki, Greece
3. Departments of Clinical Biochemistry (Vascular Prevention Clinic) and Surgery (K.T., D.P.M.), Royal Free Hospital Campus, University College Medical School, University College London, London NW3 2QG, United Kingdom