1. Institute of Advanced Biomedical Engineering and Science; Tokyo Women's Medical University, 8-1 Kawada-Cho, Shinjuku-Ku; Tokyo; Japan
2. Pulp Biology and Endodontics, Graduate School of Tokyo Medical and Dental University; 1-5-45 Yushima; Bunkyo-ku, Tokyo; Japan
3. Department of Biochemistry; Akita University School of Medicine; Hondo 1-1-1, Akita; Japan