1. Department of Medical Science and Welfare, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan
2. Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
3. Department of Primary Care and Medical Education, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan
4. Department of Rehabilitation, Tsukuba Memorial Hospital, Tsukuba, Japan