1. Department of Human Biology and Pathophysiology, Division of Oral Medicine and Pathology, School of Dentistry, Health Sciences University of Hokkaido, Hokkaido 061‑0293, Japan
2. Department of Oral Growth and Development, Division of Pediatric Dentistry, Graduate School of Dentistry, Health Sciences University of Hokkaido, Hokkaido 061‑0293, Japan
3. Department of Oral Growth and Development, Division of Disease Control and Molecular Epidemiology, School of Dentistry, Health Sciences University of Hokkaido, Hokkaido 061‑0293, Japan