1. Graduate Course of Health and Social Services Master’s Program, Saitama Prefectural University, Saitama, Japan
2. National Institute for Communicable Disease Control and Prevention, and State Key Laboratory for Infectious Disease Prevention and Control, Chinese Centre for Disease Control and Prevention, Beijing, China
3. Department of Bacteriology I, National Institute of Infectious Diseases, Tokyo, Japan
4. Department of Health Sciences, Saitama Prefectural University, Saitama, Japan