1. Department of Orthopaedic Surgery, Osaka City University Medical School, Osaka, Japan,
2. Department of Orthopaedic Surgery, Osaka City General Hospital, Osaka, Japan,
3. Center for Senile Degenerative Disorders (CSDD), Osaka City University Medical School, Osaka, Japan,
4. Department of Health and Sports Sciences, Mukogawa Women’s University, Hyogo, Japan, and
5. Shirahama Foundation for Health and Welfare, Search Institute for Bone and Arthritis Disease (SINBAD), Wakayama, Japan