1. Influenza Research Institute, School of Veterinary Medicine, University of Wisconsin—Madison, Madison, Wisconsin, USA
2. National Institute of Hygiene and Epidemiology, Hanoi, Vietnam
3. Division of Virology, Department of Microbiology and Immunology and International Research Center for Infectious Diseases, Institute of Medical Science, University of Tokyo, Tokyo, Japan
4. Infection-Induced Host Responses Project, Exploratory Research for Advanced Technology, Saitama, Japan