[1] Univ Oxford, Ctr Clin Magnet Resonance Res, Radcliffe Dept Med, Oxford, England
[2] Univ Oxford, Radcliffe Dept Med, Oxford, England
[3] St Vincents Hosp, Cardiol, Sydney, NSW, Australia
[4] Univ Michigan Hosp, Ann Arbor, MI 48109 USA
[5] Aristotle Univ Thessaloniki, Cardiol, Thessaloniki, Greece