oleh Morikawa, Tetsuro; Division of Oral Medicine and Pathology, School of Dentistry, Department Postgraduate Program, Health Sciences University of Hokkaido , Paudel, Durga; Division of Oral Medicine and Pathology, School of Dentistry, Department Postgraduate Program, Health Sciences University of Hokkaido , Onishi, Aya; Division of Oral Medicine and Pathology, School of Dentistry, Department Postgraduate Program, Health Sciences University of Hokkaido , Hiraki, Daichi; Division of Oral Medicine and Pathology, School of Dentistry, Department Postgraduate Program, Health Sciences University of Hokkaido , Adhikari, Bhoj Raj; Division of Oral Medicine and Pathology, School of Dentistry, Department Postgraduate Program, Health Sciences University of Hokkaido , Neopane, Puja; Division of Oral Medicine and Pathology, School of Dentistry, Department Postgraduate Program, Health Sciences University of Hokkaido , Harada, Fumiya; Division of Oral Medicine and Pathology, School of Dentistry, Department Postgraduate Program, Health Sciences University of Hokkaido , Utsunomiya, Masafumi; Division of Oral Medicine and Pathology, School of Dentistry, Department Postgraduate Program, Health Sciences University of Hokkaido , Yoshida, Koki; Division of Oral Medicine and Pathology, School of Dentistry, Faculty staff, Health Sciences University of Hokkaido , Sato, Jun; Division of Oral Medicine and Pathology, School of Dentistry, Faculty staff, Health Sciences University of Hokkaido , Nishimura, Michiko; Division of Oral Medicine and Pathology, School of Dentistry, Faculty staff, Health Sciences University of Hokkaido , Abiko, Yoshihiro; Division of Oral Medicine and Pathology, School of Dentistry, Faculty staff, Health Sciences University of Hokkaido