Affiliation: | 1. Department of Epidemiology, Infectious Disease Control and Prevention, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan;2. Department of Management Studies, Graduate School of Social Sciences, Hiroshima University, Hiroshima, Japan;3. Miyakawa Memorial Research Foundation, Tokyo, Japan;4. Ministry of Health, Phnom Penh, Cambodia |