1. Department of Infectious Diseases, Research Institute, Toyama, Shinjuku, Tokyo, Japan
2. National Center for Global Health and Medicine, Toyama, Shinjuku, Tokyo, Japan; Department of Microbiology, Institute of Medicine, Tribhuvan University, Maharajgunj, Kathmandu, Nepal
3. Department of International Medical Cooperation, Toyama, Shinjuku, Tokyo, Japan