1. Private Practice, Daejeon, Korea.
2. Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A. T. Still University, Mesa, AZ, USA.
3. Graduate School of Dentistry, Kyung Hee University, Seoul, Korea.
4. Private Practice, Okayama, Japan.
5. Department of Mechanical Engineering, Nagoya Institute of Technology, Nagoya, Japan.
6. Department of Orthodontics, Wonkwang University School of Dentistry, Iksan, Korea.
7. Wonkwang Dental Research Institute, Wonkwang University School of Dentistry, Iksan, Korea.
8. The Korean Orthodontic Research Institute Inc., Seoul, Korea.