1. Department of Oral and Maxillofacial Surgery, Kushiro Rosai Hospital
2. Department of Oral and Maxillofacial Surgery, Kaiseikai Onishi Hospital
3. Department of Oral and Maxillofacial Surgery, Hakodate Goryoukaku Hospital
4. Department of Dentistry and Oral Surgery, Hakodate Central General Hospital
5. Department of Dentistry and Oral Surgery, Kyoaikai Hospital
6. Department of Dentistry and Oral Surgery, Hakodate Kyokai Hospital
7. Department of Dentistry and Maxillofacial Surgery, Keiyukai Sapporo Hospital
8. Keiyukai Dentistry & Maxillofacial Surgery Clinic
9. Department of Oral and Maxillofacial Surgery, Teine Keijinkai Hospital
10. Department of Oral and Maxillofacial Surgery, JR Sapporo Hospital
11. Department of Dentistry and Oral Surgery, Sapporo Higashi Tokushukai Hospital
12. Department of Dentistry and Oral Surgery, Higashi Sapporo Hospital
13. Department of Oral and Maxillofacial Surgery, Sapporo Tokushukai Hospital
14. Department of Oral and Maxillofacial Surgery, Hokkaido Chuo Rosai Hospital
15. Department of Oral and Maxillofacial Surgery, Tomakomai City Hospital
16. Department of Dentistry and Oral Surgery, Nikko Memorial Hospital
17. Department Oral and Maxillofacial Surgery, Asahikawa Red Cross Hospital
18. Department of Oral and Maxillofacial Surgery, Asahikawa City Hospital
19. Department of Oral Surgery, Yoshida Hospital
20. Department of Dentistry and Oral Surgery, Azabu Kitami Triology Hospital
21. Department of Dentistry and Oral Surgery, Kitami Red Cross Hospital
22. Department of Dentistry and Oral Surgery, Hokusei Memorial Hospital
23. Department of Dentistry and Oral Surgery, Obihiro Daiichi Hospital
24. Department of Dentistry and Oral Surgery, Kushiro Red Cross Hospital
25. Department of Dentistry and Oral Surgery, Kushiro City General Hospital
26. Center for Translational Research, The Institute of Medical Science, The University of Tokyo
27. Department of Oral Surgery, Hokuto Hospital