1. Department of Orthopedic Surgery, Ewha Womans University Mokdong Hospital, Seoul, Korea.
2. Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Orthopedic Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
4. Biomedical Research Institute, Seoul National University Bundang Hospital, Seongnam, Korea.
5. Department of Orthopedic Surgery, Myongji Hospital, Goyang, Korea.