1. Department of Maxillofacial Surgery; Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima; Bunkyo Tokyo 113-8549 Japan
2. Department of Organic Biomaterials; Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai; Chiyoda Tokyo 101-0062 Japan