1. Division of Infectious Disease Control, Center for Infectious Diseases, Kobe University Graduate School of Medicine, Kobe, Japan
2. Medicine, Udayana University Department of Clinical Microbiology, Faculty of, Bali, Indonesia
3. Laboratory of Virus Control, Center for Infectious Disease Education and Research, Osaka University, Osaka, Japan
4. Laboratory of Virus Control, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
5. Department of Microbiology and Immunology, Faculty of Medicine, Hokkaido University, Sapporo, Hokkaido, Japan