1. Department of Virology, Institute of Tropical Medicine and Leading Program, Nagasaki University, Nagasaki, Japan;
2. Department of Pediatrics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan;
3. Department of Pediatric Infectious Diseases, Institute of Tropical Medicine, Nagasaki University, Nagasaki, Japan;
4. National Institute of Hygiene and Epidemiology, Hanoi, Vietnam;
5. Research and Biotechnology, St. Luke’s Medical Center, Quezon City, Philippines