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
4. Oral Rehabilitation; Niigata University Medical and Dental Hospital; Niigata Japan
5. Department of Health and Nutrition, Faculty of Human Life Studies; University of Niigata Prefecture; Niigata Japan
6. Department of Cariology, Restorative Sciences, and Endodontics; School of Dentistry, University of Michigan; Ann Arbor Michigan USA