1. Department of Orthopaedic Surgery, Chung-Ang University College of Medicine, Seoul, Korea.
2. Department of Orthopaedic Surgery, Murup Hospital, Changwon, Korea.
3. Department of Orthopaedic Surgery, Kyung Hee University School of Medicine, Seoul, Korea.
4. Department of Orthopaedic Surgery, Hyundae General Hospital, Namyangju, Korea.