1. Korea Ordnance Tactical Attack Range, Republic of Korea Air Force, Yeongwol, Korea.
2. Department of Orthopedic Surgery, International Baro Hospital, Incheon, Korea.
3. Department of Orthopedic Surgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Department of Orthopedic Surgery, Dongguk University Ilsan Hospital, Goyang, Korea.