1. Department of Epidemiology, Infectious Disease Control and Prevention, Graduate School of Biomedical and Health Sciences Hiroshima University Hiroshima Japan
2. Payment Certification Agency Ministry of Health Phnom Penh Cambodia
3. Clinical Department Unité de Recherche Clinique de Nanoro (URCN) Nanoro Burkina Faso
4. Faculty of Medicine University of Puthisastra Phnom Penh Cambodia
5. Secretariat University of Health Sciences Phnom Penh Cambodia
6. Expanded Programme on Immunization World Health Organization Country Office Phnom Penh Cambodia
7. National Immunization Programme Ministry of Health Phnom Penh Cambodia