[1] Princess Margaret Hosp, Dept Paediat & Adolescent Med, Lai Chi Kok, Kowloon, 2-10 Princess Margaret Hosp Rd, Hong Kong, Peoples R China
[2] Univ Hong Kong, Queen Mary Hosp, Li Ka Shing Fac Med, Dept Paediat & Adolescent Med,Pokfulam, 102 Pok Fu Lam Rd, Hong Kong, Peoples R China
[3] Playright Childrens Play Assoc, Hosp Play Serv, Hong Kong, Peoples R China
[4] Queen Mary Hosp, Dept Pathol, Div Transplantat & Immunogenet, Pokfulam, 102 Pok Fu Lam Rd, Hong Kong, Peoples R China
[5] Univ Hong Kong, Li Ka Shing Fac Med, Carol Yu Ctr Infect, Dept Microbiol, Hong Kong, Peoples R China