1 Department of Periodontology, Seoul National University Gwanak Dental Hospital, Seoul, Republic of Korea.
2 Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
3 Department of Dentistry, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
4 Seoul SUN Dental Hospital, Paju-si, Gyeonggi-do, Republic of Korea.
5 Department of Preventive Dentistry and Public Oral Health, School of Dentistry, Seoul National University, 101 Daehak-Ro, Jongno-Gu, Seoul, 03080, Republic of Korea.
6 Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea. ijj127@snu.ac.kr.
7 Department of Dental Education, School of Dentistry, Seoul National University, 1 Gwanak-Ro, Gwanak-Gu, Seoul, 08826, Republic of Korea. ijj127@snu.ac.kr.
8 Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea. stbluewi@snu.ac.kr.
9 Department of Preventive Dentistry and Public Oral Health, School of Dentistry, Seoul National University, 101 Daehak-Ro, Jongno-Gu, Seoul, 03080, Republic of Korea. stbluewi@snu.ac.kr.