1. Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio
2. Instituto Universitario del Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
3. Department of Biomedical Engineering, Duke University Hospital, Durham, North Carolina
4. Downstate Medical Center, College of Medicine, State University of New York, Albany, New York
5. Department of Orthopaedic Surgery, Lenox Hill Hospital, New York, New York