K I Paraskevas1, D P Mikhailidis2, A D Giannoukas3. 1. Sheffield Vascular Institute, Northern General Hospital, Sheffield, United Kingdom. 2. Department of Clinical Biochemistry (Vascular Disease Prevention Clinics), Royal Free Hospital Campus, University College of London (UCL), London, United Kingdom MIKHAILIDIS@aol.com. 3. Department of Vascular Surgery, University Hospital of Larissa, Larissa, Greece.