1. Department of Biomaterials, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan.
2. Advanced Research Center for Oral & Craniofacial Sciences, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan.
3. Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Osaka, Japan.