[1] Univ Calgary, Stephenson Cardiovasc MR Ctr, Libin Cardiovasc Inst Alberta, Dept Cardiac Sci & Radiol, Calgary, AB T2N 2T9, Canada
[2] Univ Calgary, Dept Pathol, Calgary, AB T2N 2T9, Canada
[3] Robert Bosch Krankenhaus, Dept Cardiol, Stuttgart, Germany
[4] Charite Univ Med Berlin, HELIOS Klinikum Berlin Buch, Franz Volhard Klin, Berlin, Germany
[5] Massachusetts Gen Hosp, Boston, MA 02114 USA
[6] Mayo Clin, Coll Med, Rochester, MN USA
[7] London Hlth Sci Ctr, London, ON, Canada
[8] Univ Leipzig, Dept Diagnost & Intervent Radiol, Leipzig, Germany
[9] Royal Brompton Hosp, London SW3 6LY, England
[10] NHLBI, NIH, Bethesda, MD 20892 USA
[11] Hop Bichat Claude Bernard, Dept Radiol, F-75877 Paris, France
[12] Univ Alberta, Div Cardiol, Edmonton, AB, Canada
[13] Klinikum Nurnberg Sud, Dept Cardiol, Nurnberg, Germany
[14] Toronto Gen Hosp, Max Bell Res Ctr, Toronto, ON, Canada