1. Division of Comprehensive Prosthodontics, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
2. Department of Oral Health Sciences, Faculty of Nursing and Health Care, BAIKA Women’s University, Ibaraki, Japan
3. Department of Oral Health Science, Faculty of Health Science, Kobe Tokiwa University, Kobe, Japan