1. Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Radiology, We Comfortable Clinic, Seoul, Korea.
3. Department of Orthopaedic Surgery, Chamjoeun Hospital, Gwangju, Korea.
4. Department of Biostatistics, Yonsei University Wonju College of Medicine, Wonju, Korea.
5. Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul, Korea.