1. Department of Orthopaedics, Osaka University Graduate School of Medicine, Osaka, Japan;
2. Department of Orthopaedics, Osaka Rosai Hospital, Osaka, Japan;
3. Department of Orthopaedics/Rheumatology, National Hospital Organization, Osaka Minami Medical Center, Osaka, Japan;
4. Department of Orthopaedics, Japan Community Health Care Organization (JCHO), Osaka Hospital, Osaka, Japan