1. Department of Public Health, School of Medicine, Sapporo Medical University, Sapporo, Japan;
2. Department of Health Care and Child Development, Saitama Children’s Medical Center, Saitama, Japan;
3. Division of Rehabilitation Medicine, Hokkaido Medical Center for Child Health and Rehabilitation, Sapporo, Japan;
4. Master Course of Health Sciences, Department of Physical Therapy, Graduate School, Sapporo Medical University, Sapporo, Japan