1. Department of Oral Medicine, Pusan Paik Hospital, Inje University, Busan, Korea
2. Department of Oral Medicine, Dental and Life Science Institute, Pusan National University School of Dentistry, Yangsan, Korea
3. Dental Research Institute, Pusan National University Dental Hospital, Yangsan, Korea
4. Dental Clinic Center, Pusan National University Hospital, Busan, Korea