1. Graduate student, Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan.
2. Associate Professor, Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan.
3. Research Assistant, Department of Human Biology and Anatomy, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan.
4. Technical Staff, Department of Human Biology and Anatomy, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan.
5. Research Assistant, Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan.
6. Professor, Department of Human Biology and Anatomy, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan.
7. Professor, Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan.
8. Associate Professor, Department of Human Biology and Anatomy, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan.