1. Department of Orthopaedic Surgery, Arthritis and Arthroplasty Design Group University of Pittsburgh Pittsburgh Pennsylvania USA
2. Department of Microbiology and Molecular Genetics, Center for Evolutionary Biology and Medicine University of Pittsburgh Pittsburgh Pennsylvania USA
3. Clinical Microbiology Laboratory University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA
4. Department of Pathology University of Pittsburgh Pittsburgh Pennsylvania USA
5. Department of Microbiology and Molecular Genetics University of Pittsburgh Pittsburgh Pennsylvania USA