1. The Lion Foundation for Dental Health, Tokyo, Japan.
2. Department of Oral Health Sciences, Nihon University School of Dentistry, Tokyo, Japan.
3. Lion Corporation, Health Care Center, Tokyo, Japan.
4. Research and Industry-University Alliance Organization, Tokyo Medical and Dental University, Tokyo, Japan.
5. Division of Functional Morphology, Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan.