1. Department of Neurosurgery, Center for Brain Injury & Repair, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
2. Department of Bioengineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
3. Center for Neurotrauma, Neurodegeneration & Restoration, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania, USA.