Corresponding Author

Department of Periodontology, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Republic of Korea

Correspondence

s: Hyo-Jung Lee Department of Periodontology, Section of Dentistry, Seoul National University Bundang Hospital, 82 Gumi-ro, 173 Beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do, 13620, Korea Tel.: +82-31-787-7547, Fax: +82-31-787-4068,

Email: periolee@gmail.com

Hyejin Lee Department of Family Medicine, Seoul National University Bundang Hospital, 82 Gumi-ro, 173 Beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do, 13620, Korea Tel: +82-31-787-7242, Fax: +82-31-787-4834,

Email: jie2128@gmail.com