1. General Dentistry, Department of Comprehensive Oral Health Care, Division of Comprehensive Patient Care, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
2. Oral Diagnosis and General Dentistry, Dental Hospital, Tokyo Medical and Dental University, Tokyo, Japan.
3. Instrumental Analysis Research Center, Tokyo Medical and Dental University, Tokyo, Japan.
4. Center for Education Research in Medicine and Dentistry, Tokyo Medical and Dental University, Tokyo, Japan.