1. Graduate School of Health Sciences, Hokkaido University, Sapporo, Hokkaido, Japan
2. Department of Rehabilitation, Sapporo Yamanoue Hospital, Sapporo, Hokkaido, Japan
3. Department of Rehabilitation, The Jikei University Hospital, Tokyo, Japan
4. Department of Rehabilitatiton Science, Faculty of Health Sciences, Hokkaido University, Sapporo, Hokkaido, Japan