1. Department of Hematology, Eiju General Hospital, Japan
2. Division of Virology, Institute of Medical Science, The University of Tokyo, Japan
3. The Research Center for Global Viral Disease, Research Institute, National Center for Global Health and Medicine, Japan
4. Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Japan
5. Pandemic Preparedness, Infection and Advanced Research Center (UTOPIA), The University of Tokyo, Japan
6. Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, USA