1. Division of Oral Bioengineering, Department of Tissue Regeneration and Reconstitution, Institute of Medicine and Dentistry, Niigata University, Niigata, Japan.
2. Division of Periodontology, Department of Oral Biological Science, Institute of Medicine and Dentistry, Niigata University, Niigata, Japan.
3. Advanced Research Center, The Nippon Dental University School of Life Dentistry at Niigata, Niigata, Japan.
4. Department of Oral and Maxillofacial Radiology, The Nippon Dental University School of Life Dentistry at Niigata, Niigata, Japan.