[1] UNSW Sydney, Sch Clin Med, Discipline Paediat & Child Hlth, Behav Sci Unit,UNSW Med & Hlth, Randwick Clin Campus, Sydney, NSW, Australia
[2] Sydney Childrens Hosp, Kids Canc Ctr, Randwick, NSW, Australia
[3] Copenhagen Univ Hosp, Juliane Marie Ctr, Dept Pediat & Adolescent Med, Rigshosp, Copenhagen, Denmark
[4] Univ Copenhagen, Fac Hlth & Med Sci, Copenhagen, Denmark
[5] Univ Coll London Hosp NHS Fdn Trust, Canc Clin Trials Unit, London NW1 2PG, England
[6] UNSW, Discipline Paediat & Child Hlth, UNSW Med & Hlth, Randwick Clin Campus, Sydney, NSW, Australia