1. Graduate School of Tokyo Medical and Dental University, Department of Cariology and Operative Dentistry, Tokyo, Japan
2. Graduate School of Tokyo Medical and Dental University, Department of Cariology and Operative Dentistry, Tokyo, JapanbTsurumi University, School of Dental Medicine, Endowed Department of International Oral Health Science, 2-1-3 Tsurumi, Tsurumi-ku, Yokoha
3. Tokyo Medical and Dental University, Clinical Oral Science, Department of Oral Health Care Sciences, Faculty of Dentistry, Tokyo, Japan
4. University of Washington School of Dentistry, Department of Restorative Dentistry, Seattle, Washington 98195, United States
5. National Center for Geriatrics and Gerontology, Department of Advanced Dental Research, Center of Advanced Medicine for Dental and Oral Diseases, Obu, Aichi, Japan