Affiliation: | 1. Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois, U.S.A.;2. Department of Orthopaedic Surgery, Wake Forest Baptist Medical Center, Salem, North Carolina, U.S.A.;3. Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, New York, U.S.A.;4. Department of Orthopaedic Surgery, Houston Methodist Hospital, Houston, Texas, U.S.A. |