1. Shimonoseki Junior College, 1-1 Sakurayama-Cho, Shimonoseki 750-8508, Yamaguchi, Japan
2. University of Human Environments, 6-2 Kamisanbonmatsu Motojuku-Cho, Okazaki 444-3505, Aichi, Japan
3. Yamaguchi Prefectural University, 3-2-1 Sakurabata, Yamaguchi 753-8502, Japan