1. Doctor of Dental Clinic, Department of Periodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea
2. Resident, Department of Periodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea
3. Associate Professor, Department of Periodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea
4. Professor, Department of Periodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea