1. Department of Orthopedic Surgery, Kyungpook National University Chilgok Hospital, Daegu, Korea.
2. Department of Orthopedic Surgery, Kyungpook National University Hospital, Daegu, Korea.
3. Department of Orthopedic Surgery, Kyungpook National University School of Medicine, Daegu, Korea.
4. Department of Medical Statistics, Kyungpook National University, Daegu, Korea.
5. Department of Biomedical Engineering, College of Medical Science, Catholic University of Daegu, Gyeongsan, Korea.