1. School of Comprehensive Human Science, University of Tsukuba, Tsukuba, Japan
2. Faculty of Preschool and Special Education, Xuzhou Kindergarten Teachers College, Xuzhou, China
3. Faculty of Nursing, Musashino University, Tokyo, Japan
4. Faculty of Nursing and Medical Care, Keio University, Tokyo, Japan
5. Faculty of Nursing, Shukutoku University, Chiba, Japan
6. Faculty of Health Medicine, Morinomiya University of Medical Sciences, Osaka, Japan
7. Faculty of Medicine, University of Tsukuba, Tsukuba, Japan