1. Department of Oral and Maxillofacial Radiology and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea
2. Department of Oral and Maxillofacial Radiology, Seoul National University Dental Hospital, Seoul, Republic of Korea
3. Department of Oral and Maxillofacial Radiology, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
4. Department of Oral and Maxillofacial Radiology, College of Dentistry, Yonsei University, Seoul, Republic of Korea
5. Department of Oral and Maxillofacial Radiology, College of Dentistry, Chosun University, Gwangju, Republic of Korea
6. Department of Oral and Maxillofacial Radiology, College of Dentistry, Gangneung-Wonju National University, Gangneung, Republic of Korea