Royal Government of Cambodia - Ministry of Health, Cambodia, World Health Organization (WHO) - Regional Office for the Western Pacific, World Health Organization (WHO), Government of the United States of America - Centers for Disease Control and Prevention (CDC), Hiroshima University, Hiroshima University, Hiroshima University, Hiroshima University, Hiroshima University, Hiroshima University, Hiroshima University, University of Health Sciences and Hiroshima University - Department of Epidemiology, Infectious Disease Control and Prevention