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