1. Department of Orthopaedic Surgery, Veterans Health Service Medical Center, Seoul, South Korea
2. Department of Orthopedic Surgery, SMG-SNU Boramae Medical Center, Seoul National University College of Medicine, Seoul, South Korea
3. Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul, South Korea
4. Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seongnam-si, South Korea