1. Department of Orthopaedic Surgery, Hanyang University Hospital, Seoul, Korea.
2. Department of Orthopedic Surgery, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
3. Department of Orthopaedic Surgery, Ewha Womans University Medical Center, Seoul, Korea.
4. Department of Orthopedic Surgery, Hallym University Dongtan Sacred Heart Hospital, Hwaseong, Korea.
5. Department of Orthopedic Surgery, Kyungpook National University Hospital, Daegu, Korea.
6. Department of Orthopaedic Surgery, Dankook University Hospital, Cheonan, Korea.
7. Department of Orthopedic Surgery, International St. Mary's Hospital, Catholic Kwandong University College of Medicine, Incheon, Korea.
8. Department of Orthopaedic Surgery, The Catholic University of Korea, Seoul St. Mary's Hospital, Seoul, Korea.
9. Department of Orthopaedic Surgery, The Catholic University of Korea, St. Vincent's Hospital, Suwon, Korea.