1. Department of Virology, Toyama Institute of Health, Japan
2. Department of Infectious Diseases, Toyama Prefectural Central Hospital, Japan
3. Department of Otolaryngology, Kurobe City Hospital, Japan
4. Infection Control Unit, Tonami General Hospital, Japan
5. Takaoka City Hospital, Japan
6. Toyama Rosai Hospital, Japan
7. Toyama Institute of Health, Japan