1. Department of Orthopedic Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
2. Department of Orthopedic Surgery, Dongguk University Ilsan Hospital, Dongguk University College of Medicine, Goyang, Korea.
3. Department of Orthopedic Surgery, Myongji Hospital, Goyang, Korea.
4. Department of Orthopedic Surgery, Seoul National University Children's Hospital, Seoul, Korea.
5. Department of Orthopedic Surgery, Ewha Womans University Mokdong Hospital, Seoul, Korea.