1. Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania.
2. Department of Neurology, Center of Cerebrovascular Disease Research, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
3. McGowan Institute for Regenerative Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
4. Department of Neurosurgery, University of Pittsburgh, Pittsburgh, Pennsylvania.
5. Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.