1. American Hip Institute, Des Plaines, Illinois, United States
2. Department of Orthopaedic Surgery, NYU Langone Medical Center, Hospital for Joint Disease, New York, New York, United States
3. Department of Orthopaedic Surgery, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, New York, United States
4. George Washington University Medical Faculty Associates, Washington, District of Columbia, United States