1. Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, Osaka, Japan
2. Division of Molecular and Regenerative Prosthodontics, Tohoku University Graduate School of Dentistry, Miyagi, Japan
3. Department of Biomaterials, Okayama University, Okayama, Japan
4. Weintraub Center for Reconstructive Biotechnology, UCLA School of Dentistry, Los Angeles, CA, USA