[1] Great Ormond St Hosp NHS Fdn Trust, CATS, London, England
[2] Birmingham Childrens Hosp NHS Fdn Trust, Birmingham, W Midlands, England
[3] Chain Hope, London, England
[4] Int Childrens Heart Fdn, Memphis, TN USA
[5] Royal Childrens Hosp, Paediat Intens Care Unit, Glasgow, Lanark, Scotland
[6] Cincinnati Childrens Hosp Med Ctr, Heart Inst, Cardiac Intens Care, Cincinnati, OH 45229 USA
[7] Paediat Retrieval Serv ScotSTAR, Glasgow Airport, Scotland
[8] Royal Childrens Hosp, Paediat Intens Care Unit, Melbourne, Vic, Australia
[9] Murdoch Childrens Res Inst, Melbourne, Vic, Australia