Affiliation: | aProfessor and chairman, Department of Orthodontics, 2nd Stage of Brain Korea 21, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju, Korea;bStudent, School of Dentistry, Chonnam National University, Gwangju, Korea;cGraduate student, School of Dentistry, Chonnam National University, Gwangju, Korea;dAssistant professor, Department of Orthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea |