1. Department of Orthopedic Surgery, Hallym University Sacred Heart Hospital, Anyang, Korea.
2. Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Orthopaedic Surgery, Chung-Ang University College of Medicine, Seoul, Korea.
4. Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Orthopaedic Surgery, Korea University College of Medicine, Seoul, Korea.
6. Department of Orthopedic Surgery, Yonsei University College of Medicine, Gangnam Severance Hospital, Seoul, Korea.