1. Department of Orthopaedic Surgery, University of Alabama at Birmingham, Birmingham, AL;
2. Department of Orthopaedic Surgery and Rehabilitation, University of Mississippi Medical Center, Jackson, MS;
3. Department of Orthopaedic Surgery, Vanderbilt Medical Center, Nashville, TN;
4. Department of Orthopaedic Surgery, University of Virginia Medical Center, Charlottesville, VA;
5. Department of Orthopaedic Surgery and Sports Medicine, University of Florida-Gainesville, Gainesville, FL; and
6. Department of Orthopaedic Surgery, University of North Carolina School of Medicine, Chapel Hill, NC.