1. Department of Medical Course, Faculty of Health and Medical Science, Teikyo Heisei University, Tokyo 170-8445, Japan
2. Department of Electrical Engineering, Faculty of Science and Engineering, Kyushu Sangyo University, Fukuoka 813-8503, Japan
3. Department of Electrical Engineering, Faculty of Engineering, Sanyo-Onoda City University, Yamaguchi 756-0884, Japan