1. Laboratory of Veterinary Infectious Diseases, Faculty of Veterinary Medicine, Nippon Veterinary and Life Science University, Musashino, Tokyo, Japan
2. Research Center for Animal Life Science, Nippon Veterinary and Life Science University, Musashino, Tokyo, Japan
3. Center for Influenza and Respiratory Virus Research, National Institute of Infectious Diseases, Tokyo, Japan
4. Department of Molecular and Cell Biology, National Center of Biotechnology, Campus Universidad Autónoma de Madrid, Madrid, Spain
5. Department of Infectious Diseases and Host Defense, Gunma University Graduate School of Medicine, Gunma, Japan