[1] Royal Childrens Hosp, Dept Cardiac Surg, Melbourne, Vic, Australia
[2] Murdoch Childrens Rsch Inst, Clin Epidemiol & Biostat Unit, Melbourne, Vic, Australia
[3] Royal Childrens Hosp, Dept Cardiol, Melbourne, Vic, Australia
[4] Womens & Childrens Hosp, Dept Cardiol, Adelaide, SA, Australia
[5] Princess Margaret Hosp Children, Childrens Cardiac Cntr, Perth, WA, Australia
[6] Univ Queensland, Mater Childrens Hosp, Queensland Paediat Cardiac Serv, Brisbane, Qld 4101, Australia
[7] Royal Melbourne Hosp, Dept Cardiol, Melbourne, Vic, Australia
[8] Monash Med Ctr, Paediat Cardiol Serv, Melbourne, Vic, Australia
[9] Notre Dame Univ, Dept Med, Fremantle, WA 6959, Australia
[10] Prince Charles Hosp, Dept Cardiol, Brisbane, Qld 4032, Australia
[11] Starship Childrens Hosp, Green Lane Congenital Cardiac Serv, Auckland, New Zealand
[12] Royal Prince Alfred Hosp, Dept Cardiol, Sydney, NSW, Australia
[13] Westmead Childrens Hosp, Heart Cntr Children, Sydney, NSW, Australia