1 Associate Professor, Division of Oral Pathology, Department of Diagnostic & Therapeutic Sciences, Meikai University School of Dentistry, Sakado, Saitama, Japan; Associate Professor, Department of Diagnostic Pathology, Tsurumi University Dental Hospital, Yokohama, Japan.
2 Lecturer, Department of Diagnostic Pathology, Tsurumi University Dental Hospital, Yokohama, Japan. Electronic address: ito-yu@tsurumi-u.ac.jp.
3 Professor, Departent of Operative Dentistry, Cariology and Pulp Biology, Tokyo Dental College, Chiyoda-ku, Tokyo, Japan.
4 Professor, Division of Oral Pathology, Department of Diagnostic & Therapeutic Sciences, Meikai University School of Dentistry, Sakado, Saitama 350-0283, Japan.