[1] Showa Univ, Dept Oral Diagnost Sci, Div Pathol, Tokyo, Japan
[2] Showa Univ, Dept Oral Diagnost Sci, Div Radiol, Tokyo, Japan
[3] Showa Univ, Sch Dent, Dept Oral & Maxillofacial Surg, Tokyo 142, Japan
[4] Showa Univ, Sch Med, Dept Pathol, Tokyo 142, Japan
[5] Showa Univ, Koto Toyosu Hosp, Dept Pathol, Tokyo, Japan