1. Department of Neurology, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
2. Department of Pathology, University of Iowa, Iowa City, Iowa, USA.
3. Department of Anesthesiology and Critical Care Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
4. Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
5. Department of Biostatistics, Epidemiology, and Informatics, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
6. Center for Brain Injury and Repair, University of Pennsylvania, Philadelphia, Pennsylvania, USA.