Affiliation: | 1 National Institute of Hygiene and Epidemiology, Hanoi, Vietnam;2 Department of Network Coordination, Children''s Hospital 1, Ho Chi Minh City, Vietnam;3 Department of Network Coordination, Children''s Hospital 2, Ho Chi Minh City, Vietnam;4 Department of Radiology, Children''s Healthcare of Atlanta, Atlanta, GA;5 National Center for Immunizations and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA |