1. Department of Orthopaedic Surgery, Vanderbilt University Medical Center, Nashville, Tennessee
2. Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee
3. PathGroup Laboratories, Nashville, Tennessee
4. Department of Pathology, Cleveland Clinic, Cleveland, Ohio
5. Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio