1. Department of Oral Anatomy; School of Dentistry, Pusan National University, Busandaehak-ro, 49, Mulguem-eup; Yangsan-si Gyeongsangnam-do 50612 South Korea
2. BK21 PLUS Project, School of Dentistry, Pusan National University, Busandaehak-ro, 49, Mulguem-eup; Yangsan-si Gyeongsangnam-do 50612 South Korea
3. Department of Dental Hygiene; Silla University, 140 Baekyang-daero 700 beon-gil; Busan 46958 South Korea
4. Department of Oral Pathology; School of Dentistry, Pusan National University, Busandaehak-ro, 49, Mulguem-eup; Yangsan-si Gyeongsangnam-do 50612 South Korea