[1] Johns Hopkins Univ Hosp, Dept Neurosurg, Baltimore, MD 21287 USA
[2] Columbia Univ, Dept Neurosurg, New York, NY USA
[3] Presbyterian Hosp, New York, NY USA
[4] Columbia Univ, Dept Neurosurg, New York, NY 10027 USA
[5] Columbia Univ, Dept Radiol, New York, NY 10027 USA
[6] Univ Pittsburgh, Dept Pathol, Pittsburgh, PA USA
[7] Columbia Univ, Dept Pathol, New York, NY USA
[8] Columbia Univ, Dept Neurol, New York, NY USA