1Department of Oral and Maxillofacial Surgery, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea
2Department of Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
3Prosthodontics and Undergraduate Research Section, University of the East College of Dentistry, Manila, Philippines
4Surgery Department, University of the East-College of Dentistry, Manila, Philippine, Philippine College of Oral and Maxillofacial Surgery, Manila, Philippines