1. Division of Oral Molecular Microbiology; Department of Oral Pathobiological Science; Hokkaido University Graduate School of Dental Medicine; Sapporo Japan
2. Division Oral Diagnosis and Medicine; Department of Oral Pathobiological Science; Hokkaido University Graduate School of Dental Medicine; Sapporo Japan
3. Division of Biomaterials and Bioengineering; Department of Oral Health Science; Hokkaido University Graduate School of Dental Medicine; Sapporo Japan
4. Department of Molecular Bacteriology and Immunology; Graduate School of Medicine; University of the Ryukyus; Nishihara Okinawa Japan