1. Division of Oral Physiology; Department of Oral Biological Science; Niigata University Graduate School of Medical and Dental Sciences; 2-5274, Gakkocho-dori Niigata 951-8514 Japan
2. Department of Physiology; Nihon University School of Dentistry; Tokyo Japan
3. Faculty of Dentistry; Department of Oral Biology and Biomedical Sciences; University of Malaya; Kuala Lumpur Malaysia
4. Division of Orthodontics; Department of Oral Biological Science; Niigata University Graduate School of Medical and Dental Sciences; Niigata Japan