1. Center for Hip Arthroscopy and Joint Preservation, Cincinnati Sports Medicine and Orthopaedic Center, Mercy Health, Cincinnati, Ohio, USA
2. Hip Preservation Center, Division of Sports Medicine, Department of Orthopedic Surgery, Rush University Medical Center, Rush Medical College of Rush University, Chicago, Illinois, USA
3. Division of Sports Medicine, Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, North Carolina, USA
4. Division of Sports Medicine, Department of Orthopaedic Surgery, Case Western Reserve University, Cleveland, Ohio, USA