[1] Wessex Neurol Ctr, Southampton, Hants, England
[2] Univ Southampton, Univ Hosp Southampton, Southampton, Hants, England
[3] Univ Cambridge, MRC Cognit & Brain Sci Unit, Cambridge, England
[4] Washington Univ, Dept Neurol Surg, St Louis, MO 63110 USA
[5] Mayo Clin, Dept Neurol Surg, Rochester, MN USA
[6] Mayo Clin, Dept Radiol, Rochester, MN USA
[7] Univ Virginia, Dept Neurol Surg, Charlottesville, VA USA
[8] Univ Washington, Dept Neurol Surg, Seattle, WA 98195 USA
[9] Univ Washington, Stroke & Appl Neurosci Ctr, Seattle, WA 98195 USA
[10] Univ Florida, Dept Neurol Surg, Gainesville, FL USA
[11] Univ Iowa, Dept Neurol, Iowa City, IA 52242 USA
[12] Univ Iowa, Dept Radiol, Iowa City, IA 52242 USA
[13] Univ Illinois, Dept Neurol Surg, Chicago, IL USA
[14] Univ Med Ctr Groningen, Dept Neurol Surg, Groningen, Netherlands
[15] Univ Miami, Dept Neurol Surg, Coral Gables, FL 33124 USA
[16] Tokushima Univ, Inst Biomed Biosci, Grad Sch, Dept Neurosurg, Tokushima, Japan
[17] Univ Calif San Francisco, Weill Inst Neurosci, Dept Neurosurg, San Francisco, CA 94143 USA
[18] Univ Pittsburgh, Dept Neurol Surg, Pittsburgh, PA 15260 USA
[19] Washington Univ, Mallinckrodt Inst Radiol, St Louis, MO USA
[20] Brigham & Womens Hosp, Dept Neurosurg, 75 Francis St, Boston, MA 02115 USA