1. Center for Applied Biomechanics, University of Virginia, Charlottesville, Virginia.
2. Department of Biomedical Engineering, Duke University, Durham, North Carolina.
3. Department of Emergency Medicine, University of Virginia, Charlottesville, Virginia.
4. Center for Comparative Medicine, University of Virginia, Charlottesville, Virginia.
5. Department of Pathology, Duke University Medical Center, Duke University Medical Center, Durham, North Carolina.
6. Department of Psychiatry, Durham VA Medical Center, Durham, North Carolina.