1. Major in Medical Engineering and Technology, Graduate School of Medical Technology and Health Welfare Sciences; Hiroshima International University; Kurose-Gakuendai 555-36, Higashi-Hiroshima Hiroshima Japan
2. Faculty of Rehabilitation, Department of Rehabilitation; Hiroshima International University; Kurose-Gakuendai 555-36, Higashi-Hiroshima Hiroshima 739-2695 Japan
3. Institute of Biomedical and Health Sciences; Hiroshima University; 1-2-3, Kasumi, Minami-Ku Hiroshima Japan