1. Department of Dentistry, Oral and Maxillofacial Surgery, Jichi Medical University, Tochigi, Japan
2. Advanced Biomaterials Department, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
3. Department of Materials Science, Graduate School of Engineering, The University of Tokyo, Tokyo, Japan
4. Department of Pathology, Nihon University School of Dentistry, Tokyo, Japan
5. Development and Support Center, National Institute of Radiological Science, Chiba, Japan