1. Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopaedic Surgery, Rush Medical College of Rush University, Rush University Medical Center, Chicago, Illinois, USA
2. Department of Orthopaedics, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
3. Department of Orthopedic Surgery, Houston Methodist University, Houston, Texas, USA
4. Department of Orthopedic Surgery, University of Southern California, Los Angeles, California, USA
5. Department of Orthopedic Surgery, Duke University, Durham, North Carolina, USA