1. Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422, Japan
2. Division of Dental Anesthesia, School of Dentistry, University of Tokushima, 3-18-15 Kuramoto, Tokushima 770, Japan
3. Graduate School of Human Informatics, Nagoya University, Nagoya 464-01, Japan