1. Department of Microbiology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
2. Center of Excellence in Emerging and Re-emerging Diarrheal Viruses, Chiang Mai University, Chiang Mai, Thailand
3. Department of Developmental Medical Sciences, School of International Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
4. Department of Pathology and Microbiology, Nihon University School of Medicine, Tokyo, Japan