1. Department of Orthopedic Surgery, Jeju National University, Jeju, Republic of Korea
2. Department of Pathology, Jeju National University, Jeju, Republic of Korea
3. Shiley Center for Orthopaedic Research & Education at Scripps Clinic, La Jolla, CA, USA
4. Department of Orthopedic Surgery, Inha University Hospital, Incheon, Republic of Korea