Affiliation: | 1. Department of Orthopedic Surgery, St. Vincent''s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea;2. Department of Orthopedic Surgery, Suwon Nanoori hospital, Suwon, Republic of Korea;3. Department of Orthopedic Surgery, Incheon Nanoori hospital, Incheon, Republic of Korea |