1. Department of Neurology Thomas Jefferson University Philadelphia PA 19107 USA
2. Center for Brain Injury & Repair Department of Neurosurgery Perelman School of Medicine University of Pennsylvania Philadelphia PA 19104 USA
3. Center for Neurotrauma Neurodegeneration & Restoration Corporal Michael J. Crescenz Veterans Affairs Medical Center Philadelphia PA 19104 USA
4. Department of Bioengineering School of Engineering and Applied Science University of Pennsylvania Philadelphia PA 19104 USA
5. Computational Biomechanics Group Department of Mechanical & Nuclear Engineering Department of Biomedical Engineering The Pennsylvania State University University Park PA 16801 USA