1. Division of Infectious Disease Control, Center for Infectious Diseases, Kobe University Graduate School of Medicine, Kobe, Japan
2. Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, Tokyo, Japan
3. Department of Virology II, National Institute of Infectious Diseases, Tokyo, Japan
4. Center for Infectious Diseases Education and Research (CiDER), Osaka University, Osaka, Japan
5. Laboratory of Virus Control, Research Institute for Microbial Diseases (RIMD), Osaka University, Osaka, Japan