1. Division of Oral and Maxillofacial Surgery, Department of Oral Medicine and Surgery; Tohoku University Graduate School of Dentistry; Sendai Miyagi Japan
2. Division of Pathology; Miyagi Cancer Center; Natori Miyagi Japan
3. Division of Oral Pathology, Department of Oral Medicine and Surgery; Tohoku University Graduate School of Dentistry; Sendai Miyagi Japan