1. Graduate School of Nursing Sapporo City University Sapporo Japan
2. School of Nursing Sapporo City University Sapporo Japan
3. AI Laboratory Sapporo City University Sapporo Japan
4. Hagiwara Dental Clinic Ashibetsu Japan
5. Takamatsu Dental Office Ishikari Japan
6. Akaiwa Ryo Dental Clinic Otaru Japan
7. Division of Fixed Prosthodontics and Oral Implantology Department of Oral Rehabilitation School of Dentistry Health Sciences University of Hokkaido Ishikari‐Tobetsu Japan