1. International Emerging Infections Program, National Center for Infectious Diseases, Centers for Disease Control and Prevention; Atlanta Georgia
2. Department of Disease Control; Ministry of Public Health; Building 7, 3rd floor, Tivanon Road Nonthaburi 11000 Thailand
3. Department of Medical Sciences; Ministry of Public Health; Tivanon Road Nonthaburi 11000 Thailand
4. Bureau of Epidemiology, Department of Disease Control; Ministry of Public Health; Tivanon Road Nonthaburi 11000 Thailand