1. Department of Orthopedic Surgery, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea
2. Department of Orthopedic Surgery, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea
3. Department of Orthopedic Surgery, Inje University Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea
4. Department of Orthopedic Surgery, Veterans Health Service Medical Center, Seoul, Korea
5. Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea