1 Respiratory Department, Da Nang Hospital for Women and Children, Da Nang 550000, Viet Nam. phuongty832000@gmail.com.
2 Discipline of Paediatrics and Adolescent Medicine, The Children's Hospital at Westmead, The University of Sydney, Westmead 2145, NSW, Australia. phuongty832000@gmail.com.
3 Infectious diseases department, Da Nang Hospital for Women and Children, Da Nang 550000, Viet Nam. bsnguyhnd@gmail.com.
4 Tuberculosis and Lung Diseases Hospital, Da Nang 550000, Viet Nam. thanhbvlbp@gmail.com.
5 Discipline of Paediatrics and Adolescent Medicine, The Children's Hospital at Westmead, The University of Sydney, Westmead 2145, NSW, Australia. ben.marais@health.nsw.gov.au.
6 Marie Bashir Institute for Infectious Diseases and Biosecurity, The University of Sydney, Westmead 2145, NSW, Australia. ben.marais@health.nsw.gov.au.