1. Department of Developmental and Regenerative Dentistry; School of Life Dentistry at Tokyo; The Nippon Dental University; 1-9-20 Fujimi Chiyoda-ku Tokyo 102-8159 Japan
2. Research Center for Odontology; School of Life Dentistry at Tokyo, The Nippon Dental University; 1-9-20, Fujimi-cho Chiyoda-ku Tokyo 102-8159 Japan
3. Department of Anatomy; Tokyo Dental College; 1-2-2 Masago Mihama-ku Chiba 261-8502 Japan
4. Japan Farm CLAWN Institute; 3504-157 Asaikeda, Maeme, Hishikari Isashi Kagoshima 895-2701 Japan