[1] Univ Utrecht, Med Ctr, Dept Radiol, E-01-132,Heidelberglaan 100, NL-3584 CX Utrecht, Netherlands
[2] Univ Hosp Leuven, Dept Radiol, Leuven, Belgium
[3] Katholieke Univ Leuven, Dept Imaging & Pathol, Herestr 49, B-3000 Leuven, Belgium
[4] McGill Univ, Dept Med, 1001 Decarie Blvd, Montreal, PQ H4A 3J1, Canada
[5] McGill Univ, Dept Diagnost Radiol, 1001 Decarie Blvd, Montreal, PQ H4A 3J1, Canada
[6] Royal Brompton Hosp, Dept Radiol, Sydney St, London SW3 6NP, England
[7] Imperial Coll, Natl Heart & Lung Inst, South Kensington Campus, London SW7 2AZ, England
[8] Ctr Cardiovasc Imaging, Sci, Great Ormond St, London WC1N 3JH, England
[9] Great Ormond St Hosp Sick Children, UCL Inst Cardiovasc, Great Ormond St, London WC1N 3JH, England
[10] Univ Oxford, John Radcliffe Hosp, Oxford Ctr Clin Magnet Resonance Res OCMR, Div Cardiovasc Med,Radcliffe Dept Med, Oxford OX3 9DU, England
[11] Boston Childrens Hosp, Dept Cardiol, 300 Longwood Ave,2nd Floor, Boston, MA 02115 USA
[12] Harvard Med Sch, Dept Pediat, 300 Longwood Ave,2nd Floor, Boston, MA 02115 USA
[13] Indiana Univ Sch Med, Krannert Inst Cardiol, 340 West 10th St,Fairbanks Hall,Suite 6200, Indianapolis, IN 46202 USA
[14] Royal Brompton Hosp, Sydney St, London SW3 6NP, England
[15] Imperial Coll, South Kensington Campus, London SW7 2AZ, England