1. Department of Orthopedic Surgery, Gangnam JS Hospital, Seoul, Republic of Korea.
2. Department of Orthopedic Surgery, Nowon Eulji Medical Center, Eulji University, Seoul, Republic of Korea.
3. Department of Orthopedic Surgery, Shihwa Medical Center, Siheung, Republic of Korea.
4. Department of Orthopaedic Surgery, Case Western Reserve University, Cleveland, Ohio, USA.