[1] Synergus AB, Danderyd, Sweden
[2] Royal Hosp Sick Children, Scottish Extracorporeal Life Support Serv, Glasgow G3 8SJ, Lanark, Scotland
[3] Golden Jubilee Natl Hosp, Scottish Natl Adv Heart Failure Serv, Clydebank, Dunbartan, England
[4] Karolinska Inst, Dept Learning Informat Management & Eth, Med Management Ctr, Stockholm, Sweden
[5] Freeman Rd Hosp, Paediat & Neonatal ECMO Serv, Newcastle Upon Tyne NE7 7DN, Tyne & Wear, England
[6] Wythenshawe Hosp, Dept Cardiothorac Transplant, Manchester M23 9LT, Lancs, England
[7] Glenfield Gen Hosp, Leicester LE3 9QP, Leics, England