[1] Queen Mary Univ London, William Harvey Res Inst, London, England
[2] Barts Hlth NHS Trust, Barts Heart Ctr, London, England
[3] Johns Hopkins Univ, Dept Med, Div Cardiol, Baltimore, MD USA
[4] Johns Hopkins Univ, Dept Radiol, Baltimore, MD USA
[5] Univ Wisconsin, Dept Radiol, Sch Med & Publ Heath, Madison, WI USA