1. Division of Preventive Dentistry, Department of Oral Health Science; Niigata University Graduate School of Medical and Dental Sciences; Niigata Japan
2. Division of Community Oral Health Development; Kyushu Dental University; Kitakyushu Japan
3. Division of Oral Science for Health Promotion, Department of Oral Health and Welfare; Niigata University Graduate School of Medical and Dental Sciences; Niigata Japan