1. Department of Restorative Dentistry Faculty of Dental Medicine Hokkaido University Hokkaido Japan
2. Section for Clinical Education Faculty of Dental Medicine Hokkaido University Hokkaido Japan
3. Department of Vascular Biology and Molecular Pathology Faculty of Dental Medicine Hokkaido University Hokkaido Japan
4. Department of Biomaterials and Bioengineering Faculty of Dental Medicine Hokkaido University Hokkaido Japan
5. Department of Conservative Dentistry and Endodontics Sapporo Dental College and Hospital Dhaka Bangladesh
6. Department of Restorative Dentistry Faculty of Dentistry University of Malaya Kuala Lumpur Malaysia