1. Division of Oral Science for Health Promotion; Department of Oral Health and Welfare; Niigata University Graduate School of Medical and Dental Sciences; Niigata Japan
2. Division of Oral Hygiene; Department of Clinical Technology; Niigata University Medical and Dental Hospital; Niigata Japan
3. Division of Welfare; Department of Oral Health and Welfare; Niigata University Graduate School of Medical and Dental Sciences; Niigata Japan