1. Department of Orthopedic Surgery, Bucheon St. Mary's Hospital, The Catholic University of Korea, Bucheon, Korea.
2. Department of Orthopedic Surgery, Incheon St. Mary's Hospital, The Catholic University of Korea, Incheon, Korea.
3. Department of Orthopedic Surgery, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
4. Department of Orthopedic Surgery, Gil Medical Center, College of Medicine, Gachon University, Incheon, Korea.
5. Department of Orthopaedic Surgery, College of Medicine, Inha University, Incheon, Korea.