1. Department of Orthopaedic Surgery, Hanyang University College of Medicine, Seoul, Korea.
2. Department of Orthopaedic Surgery, Myongji Hospital, Goyang, Korea.
3. Department of Orthopaedic Surgery, Eulji University College of Medicine, Seoul, Korea.
4. Department of Orthopaedic Surgery, Hallym University Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea.
5. Department of Orthopaedic Surgery, Ajou University School of Medicine, Suwon, Korea.