1Department of Orthopaedic Surgery, Washington University School of Medicine, 14532 South Outer Forty Drive, Chesterfield, MO 63017
2Department of Orthopaedic Surgery, Washington University School of Medicine, 660 South Euclid Avenue, Campus Box 8233, St. Louis, MO 63110
3Department of Orthopaedic Surgery, Vanderbilt University Medical Center, 1215 21st Avenue South, MCE, South Tower, Suite 4200, Nashville, TN 37232
4Department of Biostatistics, Vanderbilt University Medical Center, 2525 West End, Suite 11000, Nashville, TN 37203
5Department of Orthopaedic Surgery, Cleveland Clinic Foundation, 5555 Transportation Boulevard, Garfield Heights, OH 44125