1. Department of Preventive Medicine and Public Health, Tokyo Medical University, Tokyo, Japan
2. Department of Infection Prevention and Control, Tokyo Medical University Hospital, Tokyo, Japan
3. Department of International Medical Communications, Tokyo Medical University, Tokyo, Japan
4. Division of International Health (Public Health), Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
5. Graduate School of Environmental Studies, Tohoku University, Sendai, Japan