1. Faculty of Health Sciences, Hokkaido University, Sapporo, Hokkaido 060-0812, Japan
2. Department of Rehabilitation for the Movement Functions, Research Institute of National Rehabilitation Center for Persons with Disabilities, Tokorozawa 359-8555, Japan
3. Faculty of Education, Hokkaido University, Sapporo, Hokkaido 080-0811, Japan
4. Graduate School of Education, Hokkaido University, Sapporo, Hokkaido 080-0811, Japan
5. Department of Occupational Therapy, Hokkaido Bunkyo University, Eniwa 061-4119, Japan
6. Graduate School of Health Sciences, Hokkaido University, Sapporo, Hokkaido 060-0812, Japan