1. Department of Oral Anatomy, School of Dentistry, Pusan National University, Busandaehak-ro 49, Mulguem-eup, Yangsan-si, Gyeongsangnam-do 50612, Republic of Korea
2. BK21 PLUS Project, School of Dentistry, Pusan National University, Busandaehak-ro 49, Mulguem-eup, Yangsan-si, Gyeongsangnam-do 50612, Republic of Korea
3. Department of Dental Hygiene, Dongeui University, Gaya 1-dong, Busanjin-gu, Busan 47230, Republic of Korea