1. Department of Orthopedic Surgery, Uijeongbu Eulji Medical Center, Uijeongbusi, Republic of Korea;
2. Department of Orthopedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea;
3. College of Art and Science, Emory University, Atlanta, Georgia;
4. Department of Orthopedic Surgery, Daejeon Eulji Medical Center, Daejeon, Republic of Korea; and
5. Department of Orthopedic Surgery, Dongguk University Ilsan Hospital, Goyangsi, Republic of Korea