[1] Phan Chau Trinh Univ, Dien Ban, Vietnam
[2] Univ Sydney, Sydney Infect Dis Inst, Sydney, Australia
[3] Philippine Gen Hosp, Manila, Philippines
[4] Cipto Mangunkusumo Hosp, Jakarta, Indonesia
[5] Sydney Childrens Hosp, Randwick, NSW, Australia
[6] Univ Sydney, Sch Publ Hlth, Fac Med, Sydney, Australia
[7] UNSW, Sch Women Childrens Hlth, Sydney, Australia