1. Graduate School of Engineering, Hiroshima University, Hiroshima, Japan.
2. Robot Rehabilitation Center in The Hyogo Institute of Assistive Technology, Kobe, Japan.
3. Kinki Gishi Corporation, Kobe, Japan.
4. Hyogo Rehabilitation Center, Kobe, Japan.
5. Department of Rehabilitation Science, Kobe University Graduate School of Medicine in Hyogo Rehabilitation Center, Kobe, Japan.