1. Department of Orthopedic Surgery, Kyung Hee University Hospital, Seoul, Republic of Korea
2. Department of Orthopedic Surgery, National Medical Center, Seoul, Republic of Korea
3. Department of Orthopedic Surgery, Uijeongbu Eulji Medical Center, Eulji University, Uijeongbu, Republic of Korea
4. Department of Medicine, Graduate School, Kyung Hee University, Seoul, Republic of Korea
5. Department of Orthopedic Surgery, Armed Forces Hongcheon Hospital, Hongcheon, Republic of Korea