1. Department of Orthopaedic Surgery, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Orthopaedic Surgery, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea.
3. Department of Orthopaedic Surgery, Kosin University Gospel Hospital, Busan, Korea.
4. Department of Orthopaedic Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.