1. Stanford University; School of Medicine; Stanford California
2. Department of Orthopaedic Surgery; Perelman School of Medicine at the University of Pennsylvania; Philadelphia Pennsylvania
3. Department of Orthopaedic Surgery; Stanford Hospitals and Clinics; Broadway Street, Redwood City Stanford 94063 California
4. Department of Medicine; Stanford School of Medicine; Stanford California
5. Department of Chemistry; University of Wisconsin-Madison; Madison Wisconsin
6. Department of Bioengineering; School of Medicine; Stanford University; Stanford California
7. Division of Infectious Diseases; Department of Medicine; Stanford University School of Medicine; Stanford California