[1] Univ Ottawa, Dept Radiol Radiat Oncol & Med Phys, Ottawa, ON, Canada
[2] Ottawa Hosp Res Inst, Ottawa, ON, Canada
[3] Univ Waterloo, Dept Syst Design Engn, Waterloo, ON, Canada
[4] Univ Ottawa, Dept Neurol, Ottawa, ON, Canada
[5] Foothills Med Ctr, Dept Neurol, Calgary, AB, Canada
[6] Univ Toronto, Dept Med Neurol, Sunnybrook Hlth Sci Ctr, Toronto, ON, Canada
[7] ASST Spedali Civili Brescia, Dept Neurol Sci & Vis, Neurol Unit, Brescia, Italy
[8] Univ Ferrara, Neurol Clin, Ferrara, Italy
[9] Univ Florence, Dept Expt & Clin Biomed Sci, Neuroradiol Unit, Florence, Italy
[10] Mayo Clin, Dept Radiol, Jacksonville, FL 32224 USA
[11] Mayo Clin, Dept Neurosurg, Jacksonville, FL 32224 USA