1. Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
2. Clinical Oral Science, Department of Oral Health Care Sciences, Faculty of Dentistry; Tokyo Medical and Dental University; Tokyo Japan
3. International Exchange Center; Tokyo Medical and Dental University; Tokyo Japan
4. Division of Oral and Dental Surgery, Department of Advanced Medicine, National Hospital for Geriatric Medicine; National Center for Geriatrics and Gerontology; Obu Aichi Japan