1. Division of Virology, Institute of Medical Science, University of Tokyo, Tokyo 108-8639, Japan
2. Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
3. Tokyo Pediatric Association Public Health Committee, Saitama 331-0815, Japan
4. Clinic Bambini, Tokyo 108-0071, Japan
5. Akebonocho Clinic, Tokyo 120-0023, Japan
6. Alpaca Kids ENT Clinic, Tokyo 171-0052, Japan
7. Hagiwara Clinic, Tokyo 173-0016, Japan
8. Wada Pediatric Clinic, Tokyo 121-0812, Japan
9. Suitengumaeikiiki Clinic, Tokyo 103-0014, Japan
10. Sotobo Child Clinic, Chiba 299-4503, Japan
11. Saitama Citizens Medical Center, Saitama 331-0054, Japan
12. Division of Infectious Diseases and Infection Control, Tohoku Medical and Pharmaceutical University, Sendai 983-8536, Japan
13. Nakagawa Ekimae Naika Clinic, Kanagawa 224-0001, Japan
14. Division of Infectious Diseases, Advanced Clinical Research Center, Institute of Medical Science, University of Tokyo, Tokyo 108-8639, Japan
15. Department of Infectious Diseases and Applied Immunology, IMSUT Hospital of the Institute of Medical Science, University of Tokyo, Tokyo 108-8639, Japan
16. Department of Special Pathogens, International Research Center for Infectious Diseases, Institute of Medical Science, University of Tokyo, Tokyo 108-8639, Japan
17. Research Center for Global Viral Diseases, National Center for Global Health and Medicine Research Institute, Tokyo 162-8655, Japan
18. The University of Tokyo Pandemic Preparedness, Infection and Advanced Research Center (UTOPIA), Minato-ku, Tokyo 108-8639, Japan