1. Department of Oral Pathology and Biology, Hokkaido University Faculty of Dental Medicine and Graduate School of Dental Medicine,Sapporo 060-8586, Japan
2. Oral Molecular Microbiology, Hokkaido University Faculty of Dental Medicine and Graduate School of Dental Medicine,Sapporo 060-8586, Japan
3. Department of Oral Diagnosis and Medicine, Hokkaido University Faculty of Dental Medicine and Graduate School of Dental Medicine,Sapporo 060-8586, Japan
4. Department of Dental Radiology, Hokkaido University Faculty of Dental Medicine and Graduate School of Dental Medicine,Sapporo 060-8586, Japan