1. Department of Oral and Maxillofacial Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Minami‑Ku, Hiroshima 734‑8553, Japan
2. Department of Public Oral Health, Program of Oral Health Sciences, Hiroshima University, Minami‑Ku, Hiroshima 734‑8553, Japan
3. Department of General Dentistry, Hiroshima University Hospital, Minami‑Ku, Hiroshima 734‑8553, Japan