1. Department of Orthopedic Surgery, Hospital for Special Surgery, New York, New York, USA.
2. Department of Orthopaedic Surgery, University of California, San Francisco–Fresno, Fresno, California, USA.
3. Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA.
4. Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, Massachusetts, USA.