1. Department of Virology III, National Institute of Infectious Diseases, Japan
2. Management Department of Biosafety, Laboratory Animals, and Pathogen Bank, National Institute of Infectious Disease, Japan
3. Department of Pediatrics, School of Medicine, Fukushima Medical University, Japan
4. Hoshi General Hospital, Japan
5. Ohara General Hospital, Japan
6. Department of Microbiology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Japan