1. Department of Orthopaedic Surgery, Inje University Haeundae Paik Hospital, College of Medicine, Inje University, Busan, Korea.
2. Department of Orthopaedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Department of Orthopedic Surgery, Ulsan University Hospital, Ulsan, Korea.
4. Department of Orthopedic Surgery, Chungbuk National University Hospital, University of Chungbuk, Cheongju, Korea.