1. Department of Bioengineering University of Pennsylvania Philadelphia PA USA
2. Department of Neurosurgery University of Pennsylvania Philadelphia PA USA
3. Center for Neurotrauma, Neurodegeneration & Restoration CMC VA Medical Center Philadelphia PA USA
4. Axonova Medical LLC Philadelphia PA USA
5. New Jersey Center for Biomaterials Rutgers University New Brunswick NJ USA
6. Dartmouth‐Hitchcock Medical Center, Division of Plastic Surgery Dartmouth College Lebanon NH USA