1. Department of Neurosurgery, Duke University School of Medicine, Durham, North Carolina, USA.
2. Department of Biomedical Engineering, Duke University Pratt School of Engineering, Durham, North Carolina, USA.
3. Downstate College of Medicine, State University of New York, Brooklyn, North Carolina, USA.
4. Department of Surgery, New York-Presbyterian/Queens, Flushing, North Carolina, USA.
5. Department of Neurosurgery, Massachusetts General Hospital, Boston, Massachusetts, USA.
6. Department of Neurosurgery, The Miller School of Medicine, University of Miami, Miami, Florida, USA.
7. Department of Surgery, University of Toronto, Toronto, Canada.
8. Department of Orthopedics, Miami Valley Hospital, Centerville, Ohio, USA.