1. Department of Oral and Maxillofacial Radiology, School of Dentistry, Matsumoto Dental University, Shiojiri, Japan.
2. Department of Hard Tissue Research, Graduate School of Oral Medicine, Matsumoto Dental University, Shiojiri, Japan.
3. School of Health Sciences, Gunma University, Maebashi, Japan.
4. Gunma University Center for Mathematics and Data Science, Maebashi, Japan.
5. Department of Obstetrics and Gynecology, Niigata City General Hospital, Niigata, Japan.