1. Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, North Carolina, USA.
2. Department of Physics, Duke University, Durham, North Carolina, USA.
3. Department of Radiology, Duke University School of Medicine, Durham, North Carolina, USA.
4. Department of Pathology, Duke University School of Medicine, Durham, North Carolina, USA.
5. Department of Biomedical Engineering, Duke University, North Carolina, USA.
6. Department of Mechanical Engineering and Materials Science, Duke University, North Carolina, USA.