1. Master's Degree, Department of Periodontology, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea
2. Resident, Department of Periodontology, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea
3. Professor, Department of Periodontology, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea