1. Laboratory of Virology, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana
2. Division of Global Epidemiology, Hokkaido University Research Center for Zoonosis Control, Sapporo, Japan
3. Global Station for Zoonosis Control, Global Institution for Collaborative Research and Education, Hokkaido University, Sapporo, Japan