1. Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba 271-8587, Japan
2. Department of Radiology, Nihon University School of Dentistry at Matsudo, Chiba 271-8587, Japan
3. Department of Neurological Surgery, Nihon University School of Dentistry at Matsudo, Chiba 271-8587, Japan