1. Department of Rheumatology/Orthopaedics, National Hospital Organization, Osaka Minami Medical Center, Osaka, Japan;
2. Department of Orthopaedics, Osaka University Graduate School of Medicine, Osaka, Japan;
3. Department of Orthopaedics, Osaka Rosai Hospital, Osaka, Japan;
4. Department of Rehabilitation, National Hospital Organization, Osaka Minami Medical Center, Osaka, Japan