1. Department of Advanced Prosthodontics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
2. Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Kagawa, Japan
3. Biomaterials and Bioengineering, Department of Oral Health Science, Faculty and Graduate School of Dental Medicine, Hokkaido University, Hokkaido, Japan