1. Penn Center for Brain Injury and Repair, The University of Pennsylvania, Philadelphia, Pennsylvania.
2. Department of Neurosurgery, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania.
3. Academic Unit of Neuropathology, Division of Clinical Neuroscience, Institute of Neurological Sciences, Southern General Hospital NHS Trust, Glasgow, United Kingdom.
4. Biostatistics Analysis Center, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania.