[1] Univ Hong Kong, Li Ka Shing Fac Med, Sch Clin Med, Dept Paediat & Adolescent Med, Hong Kong, Peoples R China
[2] Hong Kong Childrens Hosp, Dept Paediat & Adolescent Med, Hong Kong, Peoples R China
[3] St Jude Childrens Res Hosp, Dept Global Pediat Med, Memphis, TN USA
[4] St Jude Childrens Res Hosp, Dept Oncol, Memphis, TN USA