[1] Univ Amsterdam, Acad Med Ctr, Dept Cardiol, NL-1105 AZ Amsterdam, Netherlands
[2] Deutsch Herzctr, Dept Paediat Cardiol & Cogenital Heart Dis, Munich, Germany
[3] Imperial Coll Sch Med, Natl Heart & Lung Inst, Imperia, Italy
[4] Royal Brompton Hosp, Adult Congenital Heart Ctr, London SW3 6LY, England
[5] ErasmusMC, Thoraxctr, Rotterdam, Netherlands
[6] Univ Zurich Hosp, Div Cardiol, Ctr Cardiovasc, CH-8091 Zurich, Switzerland
[7] Univ Oslo, Rikshosp, Dept Cardiol, N-0027 Oslo, Norway
[8] Hosp Na Homolce, Dept Cardiac Surg, Prague, Czech Republic
[9] Katholieke Univ Leuven, Ctr Hlth Serv & Nursing Res, Louvain, Belgium
[10] Univ Padua, Dept Clin & Expt Med, I-35100 Padua, Italy
[11] Rabin Med Ctr, Dept Cardiol, Petah Tiqwa, Israel
[12] Euro Heart House, Sophia Antipolis, France
[13] Univ Lund Hosp, Dept Cardiol, S-22185 Lund, Sweden