1. Department of Orthopaedic Surgery, Stanford University, Stanford, California, USA.
2. Department of Material Science and Engineering, Stanford University, Stanford, California, USA.
3. Department of Bioengineering, Stanford University, Stanford, California, USA.
4. Department of Mechanical Engineering and School of Biomedical Engineering, Colorado State University, Fort Collins, Colorado, USA.
5. Department of Clinical Sciences, Colorado State University, Fort Collins, Colorado, USA.
6. Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, Colorado, USA.
7. Department of Chemistry, Stanford University, Stanford, California, USA.
8. Department of Mechanical Engineering, Stanford University, Stanford, California, USA.