1. Division of Neurosurgery, Dalhousie University, Halifax, Canada.
2. Department of Medical Neuroscience, Dalhousie University, Halifax, Canada.
3. Center for Stroke Research Berlin, Charite University, Berlin, Germany.
4. Division of Neurosurgery, University of Pittsburgh, Pittsburgh, PA, USA.
5. Departments of Brain and Cognitive Sciences, Physiology and Cell Biology, Ben-Gurion University of the Negev, Beer-Sheva, Israel.