1. Department of Human Mechatronics System, Graduate School of Systems Design, Tokyo Metropolitan University, Tokyo 191-0065, Japan
2. Department of Virology I, National Institute of Infectious Diseases, Tokyo 208-0011, Japan
3. Department of Hygiene and Public Health, Graduate School of Human Health Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
4. Department of Veterinary Science, National Institute Infectious Diseases, Tokyo 162-8640, Japan