1. Department of Oral Functional Prosthodontics, Division of Oral Functional Science, Graduate School of Dental Medicine Hokkaido University Sapporo Hokkaido Japan
2. Department of Preventive Dentistry Hokkaido University Hospital Sapporo Sapporo Hokkaido Japan
3. Department of Oral Rehabilitation Hokkaido University Hospital Sapporo Hokkaido Japan
4. Department of Oral Functional Prosthodontics, Division of Oral Functional Science, Faculty of Dental Medicine Hokkaido University Sapporo Hokkaido Japan