1. Department of Microbiology and Infectious Diseases, Toho University School of Medicine, Tokyo, Japan
2. Department of Respiratory Medicine, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
3. Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Hokkaido, Japan
4. National Institute of Polar Research, Research Organization of Information and Systems, Tokyo, Japan
5. Department of Polar Science, School of Multidisciplinary Sciences, SOKENDAI (The Graduate University for Advanced Studies), Tokyo, Japan