1. Department of BioengineeringUniversity of California, San Diego La Jolla CA
2. Department of Orthopaedic SurgeryUniversity of California, San Diego La Jolla CA
3. Department of OrthopaedicsUniversity of Maryland School of Medicine Baltimore MD
4. Department of NeurosurgeryMassachusetts General Hospital Boston MA
5. Research ServiceVA San Diego Healthcare System San Diego CA