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