[1] Great Ormond St Hosp Children NHS Fdn Trust, Ctr Outcomes & Experience Res Childrens Hlth Illn, Great Ormond St, London WC1N 3JH, England
[2] Univ Surrey, Sch Hlth Sci, Guildford, Surrey, England
[3] Nuffield Trust, London, England
[4] UCL Great Ormond St Inst Child Hlth, Louis Dundas Ctr Childrens Palliat Care, London, England
[5] Calvary Hlth Care Bruce, Canberra, ACT, Australia
[6] Australian Catholic Univ, Canberra, ACT, Australia