1. Department of Orthopaedic Surgery, Ajou University School of Medicine, Suwon, Korea.
2. Department of Orthopaedic Surgery, Hallym University Sacred Heart Hospital, Anyang, Korea.
3. Department of Orthopaedic Surgery, Daegu Fatima Hospital, Daegu, Korea.
4. Department of Orthopaedic Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.