[1] Med Coll Wisconsin, Dept Neurol, Milwaukee, WI 53226 USA
[2] Harvard Med Ctr, Dept Radiol, Boston, MA USA
[3] Univ Cincinnati, Dept Neurol, Cincinnati, OH USA
[4] Univ Cincinnati, Dept Radiol, Cincinnati, OH USA
[5] Tech Univ Dresden, Dept Radiol, D-01062 Dresden, Germany
[6] Univ Calif Los Angeles, Dept Neurol, Los Angeles, CA 90024 USA
[7] Stanford Univ, Dept Radiol, San Francisco, CA USA
[8] Stanford Univ, Dept Neurol, San Francisco, CA USA
[9] Northwestern Univ, Dept Neurol, Chicago, IL 60611 USA
[10] Mayo Clin, Dept Radiol, Rochester, MN USA
[11] Vanderbilt Univ, Dept Neurosurg, Nashville, TN USA
[12] Univ Edinburgh, Dept Clin Neurosci, Edinburgh, Midlothian, Scotland
[13] Oregon State Univ, Dept Neurosurg, Portland, OR USA
[14] Univ Pittsburgh, Dept Neurol, Pittsburgh, PA 15260 USA
[15] Baptist Vasc Ctr, Miami, FL USA
[16] SUNY Buffalo, Dept Neurosurg, Buffalo, NY 14260 USA
[17] Mt Sinai Med Ctr, Dept Neurosurg, Los Angeles, CA USA
[18] Univ Virginia, Dept Radiol, Charlottesville, VA USA
[19] SUNY Stony Brook, Dept Neurosurg, East Setauket, NY USA
[20] Forsyth Med Ctr, Dept Radiol, Kernersville, NC USA
[21] Univ Toronto, Dept Med Imaging, Toronto, ON, Canada
[22] Heidelberg Univ, Dept Neurol, Heidelberg, Germany
[23] Heidelberg Univ, Dept Neuroradiol, Heidelberg, Germany
[24] Univ Med Ctr, Dept Neurol, Bethesda, MD USA
[25] Washington Univ, Dept Radiol, St Louis, MO USA
[26] Case Western Reserve Univ, Dept Neurol, Cleveland, OH 44106 USA
[27] Emory Univ, Dept Neurol, Atlanta, GA 30322 USA
[28] Univ Miami, Dept Neurol, Miami, FL USA
[29] Univ Calgary, Dept Radiol, Calgary, AB, Canada
[30] Univ Calgary, Dept Neurol, Calgary, AB, Canada