1. Department of Orthopaedic Surgery, KangNam St. Mary’s Hospital, The Catholic University of Korea School of Medicine, 505 Banpo-dong, Seocho-gu, Seoul, 137-040, Republic of Korea.
2. Department of Orthopaedic Surgery Uijongbu St. Mary’s Hospital, The Catholic University of Korea School of Medicine, 65-1 Kumho-dong, Uijongbu-si, Kyunggi-do, 480-717, Republic of Korea.