1. Division of Periodontology and Endodontology, Department of Oral Rehabilitation, School of Dentistry, Health Sciences University of Hokkaido
2. Division of Geriatric Dentistry, Department of Human Biology and Pathophysiology, School of Dentistry, Health Sciences University of Hokkaido
3. Division of Biomaterials and Bioengineering, Department of Oral Rehabilitation, School of Dentistry, Health Sciences University of Hokkaido