1. Department of Speech, Language and Hearing Therapy Faculty of Health Sciences, Mejiro University, Saitama, Japan
2. Department of Doctoral Program in Rehabilitation Science, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tokyo, Japan
3. College of Education, Ibaraki University, Ibaraki, Japan
4. Faculty of Human Sciences, University of Tsukuba, Ibaraki, Japan