1. Graduate School of Humanities and Social Sciences, Hiroshima University, Higashi-Hiroshima, Japan
2. Department of Special Needs Education, Hyogo University of Teacher Education, Kato, Japan
3. Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan
4. Faculty of Human and Cultural Sciences, Sakushin Gakuin University, Utsunomiya, Japan
5. Research Team for Social Participation and Community Health, Tokyo Metropolitan Institute of Gerontology, Itabashi, Japan