1. a Department of Human Ecology, Graduate School of Health Sciences, Hokkaido University, 060-0812, Kita 12, Nishi 5, Kita-ku, Sapporo, Hokkaido, Japan
2. b Global Station for Indigenous Studies and Cultural Diversity, Hokkaido University, 001-002, Kita 21, Nishi 11, Kita-ku, Sapporo, Hokkaido, Japan
3. c Faculty of Health Sciences, Hokkaido University, 060-0812, Kita 12, Nishi 5, Kita-ku, Sapporo, Hokkaido, Japan