1. Department of Orthopaedic Surgery, Kyungpook National University Hospital, Daegu, Korea
2. Daegu Park’s Hospital, Daegu, Korea
3. Department of Orthopedic Surgery, Dongsan Medical Center, Keimyung University, Daegu, Korea
4. Department of Orthopaedic Surgery, Asan Medical Center, University of Ulsan, Seoul, Korea