[1] Da Nang Hosp Women & Children, Resp Dept, Da Nang, Vietnam
[2] Univ Sydney, Childrens Hosp Westmead, Discipline Paediat & Adolescent Med, Westmead, NSW, Australia
[3] Hoa Vang Dist Hosp, Da Nang, Vietnam
[4] Natl Hosp Paediat, Hanoi, Vietnam
[5] Univ Melbourne, Ctr Int Child Hlth, Melbourne, Vic, Australia
[6] Royal Childrens Hosp, Murdoch Childrens Res Inst, Melbourne, Vic, Australia
[7] Univ Sydney, Marie Bashir Inst Infect Dis & Biosecur, Sydney, NSW, Australia