1. Nihon University Graduate School of Dentistry at Matsudo, Oral Pathology, Matsudo, Chiba 271-8587, Japan
2. Department of Pathology, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan
3. Nihon University Graduate School of Dentistry at Matsudo, Orthodontics, Matsudo, Chiba 271-8587, Japan
4. Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan