1. Faculty of Dentistry; Niigata University; Niigata Japan
2. Department of Oral Functional Anatomy, Hokkaido University Graduate School of Dental Medicine; Sapporo; Japan
3. Division of Maxillofacial Radiology, Department of Tissue Regeneration and Reconstruction, Niigata University Graduate School of Medical and Dental Sciences; Niigata; Japan
4. Division of Anatomy and Cell Biology of the Hard Tissues; Department of Tissue Regeneration and Reconstruction, Niigata University Graduate School of Medical and Dental Sciences; Niigata Japan