1. Department of Orthopaedic Surgery; Shimoshizu National Hospital; Yotsukaido Chiba Japan
2. Department of Orthopaedic Surgery; Graduate School of Medicine; Chiba University; Chiba Japan
3. Department of Electrical Engineering and Information Systems; Department of Bioengineering; School of Engineering; University of Tokyo; Tokyo Japan
4. Department of Applied Quantum Physics; Graduate School of Engineering; Kyushu University; Fukuoka Japan