Affiliation: | (1) Department of Dental Radiology, 1757 Kanazawa, Tobetsu-cho, Ishikari-gun, 061-0293 Hokkaido, Japan;(2) Department of Oral Pathology School of Dentistry, Health Sciences University of Hokkaido, Hokkaido, Japan;(3) Nagayama Dental Clinic, Hokkaido, Japan |