1. Faculty of Informatics, Hiroshima Kokusai Gakuin University, 6-20-1, Nakano, Aki-ku, 739-0321, Hiroshima, Japan
2. Faculty of Health Sciences, Hiroshima International University, 555-36, Kurose Gakuendai, 724-0695, Higashi-Hiroshima, Japan
3. Kurashiki Sakuyo University, 3515, Tamashima Nagao, 710-0292, Kurashiki, Japan