[1] Univ London St Georges Hosp, Paediat Infect Dis Res Grp, Div Clin Sci, London SW17 0RE, England
[2] Hosp NHS Fdn Trust, Dept Paediat, London, England
[3] London S Bank Univ, London, England
[4] Royal Hosp Sick Children, Oncol Unit, Edinburgh EH9 1LF, Midlothian, Scotland
[5] Alder Hey Childrens NHS Fdn Trust, Oncol Unit, Liverpool, Merseyside, England
[6] Newcastle Tyne Hosp, NHS Fdn Trust, Dept Paediat & Adolescent Oncol, Newcastle Upon Tyne, Tyne & Wear, England
[7] Royal Marsden NHS Fdn Trust, Children & Young Peoples Unit, Sutton, Surrey, England