1. Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, Kobe, Japan.
2. Graduate School of Engineering, University of Hyogo, Kobe, Japan.
3. Faculty of Health Care Science, Department of Medical Engineering, Himeji Dokkyo University, Himeji, Japan.
4. Graduate School of Simulation Studies, University of Hyogo, Kobe, Japan.