1. Department of Radiology, Seoul National University Bundang Hospital, 82, Gumi-ro 173 Beon-gil, Bundanggu, Seongnam-si, Gyeonggi-do, Korea.
2. Present address: Korea University Ansan Hospital, Ansan-si, Gyeonggi-do, Korea.
3. Department of Orthopedic Surgery, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Korea.