1. International Research Center for Infectious Diseases, Institute of Medical Science, The University of Tokyo
2. Division of Virology, Department of Microbiology and Immunology, Institute of Medical Science, The University of Tokyo
3. Core Research for Evolutional Science and Technology, Japan Science and Technology Agency
4. National Institute of Hygiene and Epidemiology
5. National Center for Veterinary Diagnosis, Department of Animal Health, Ministry of Agriculture and Rural Development
6. Laboratory of Microbiology, Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University
7. Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison