1. Department of Orthopedic Surgery, Shizuoka General Hospital, Shizuoka, Japan
2. Department of Orthopedic Surgery, Kobe Central Municipal Hospital, Kobe, Japan
3. Department of Orthopedic Surgery, Tango Central Hospital, Tango, Japan
4. Department of Orthopedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
5. Department of Orthopedic Surgery, Mayo Health System, Owatonna, USA
6. Institute for Frontier Medical Science, Kyoto University, Kyoto, Japan