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