1. Department of Prosthodontics, Seoul St. Mary’s Dental Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
2. Division of Cariology and Endodontology, University Clinics of Dental Medicine, University of Geneva, Geneva, Switzerland
3. Department of Biostatistics, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
4. Department of Prosthodontics and Dental Research Institute, Seoul National University School of Dentistry, Seoul, Republic of Korea