[1] Aristotle Univ Thessaloniki, Hippocrat Hosp, Sch Med, Propedeut Dept Internal Med 2, GR-54006 Thessaloniki, Greece
[2] Police Med Ctr Northern Greece, Div Endocrinol, Thessaloniki, Greece
[3] UCL, Sch Med, Dept Clin Biochem, Vasc Dis Prevent Clin, London NW3 2QG, England
[4] UCL, Sch Med, Dept Surg, London NW3 2QG, England