[1] Hong Kong Childrens Hosp, Dept Paediat & Adolescent Med, Hong Kong, Peoples R China
[2] Queen Mary Hosp, Dept Paediat & Adolescent Med, Hong Kong, Peoples R China
[3] Queen Mary Hosp, Dept Diagnost Radiol, Hong Kong, Peoples R China
[4] St Teresas Hosp, Hong Kong, Peoples R China
[5] Univ Hong Kong, Li Ka Shing Fac Med, Dept Microbiol, Hong Kong, Peoples R China