1. Department of Oral and Maxillofacial Radiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700‑8558, Japan
2. Department of Oral Diagnosis and Dentomaxillofacial Radiology, Okayama University Hospital, Okayama 700‑8558, Japan
3. Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo 05508‑000, Brazil
4. Department of Oral and Maxillofacial Radiology, Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700‑8558, Japan
5. Department of Dental Informatics, Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700‑8525, Japan