| Affiliation: | 1. Department of Periodontology and Endodontology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan;2. Department of Oral Healthcare Education, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan;3. General Dentistry and Clinical Education Unit, Niigata University Medical and Dental Hospital, Niigata, Japan;4. Division of Periodontology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan |
