1. Department of Orthodontics, School of Dentistry Chonnam National University Gwangju Korea
2. Postgraduate Orthodontic Program Arizona School of Dentistry & Oral Health, A.T. Still University Mesa USA
3. Graduate School of Dentistry Kyung Hee University Seoul Korea
4. Private Practice Daegu Korea
5. Hallym University Sacred Heart Hospital Anyang Korea
6. Private Practice, Department of Orthodontics School of Dentistry, Catholic University Seoul Korea
7. Private Practice Gwangju Korea
8. Private Practice Yeosu Korea