[1] Wayne State Univ, Seattle Sci Fdn, Detroit, MI 48202 USA
[2] Wayne State Univ, Neurol Surg, Detroit, MI 48202 USA
[3] BG Univ Hosp Bergmannsheil, Swedish Neurosci Inst, Neurosurg, Bochum, Germany
[4] BG Univ Hosp Bergmannsheil, Dept Trauma Surg, Bochum, Germany
[5] Univ Chicago, Seattle Sci Fdn, Neurosurg, Chicago, IL 60637 USA
[6] Univ Chicago, Radiol, Chicago, IL 60637 USA
[7] Swedish Neurosci Inst, Neurosurg, Swedish Neurosci, Seattle, WA USA
[8] Swedish Neurosci Inst, Dept Neurosurg, Swedish Neuro, Seattle, WA USA
[9] Swedish Neurosci Inst, Complex Spine, Neurosurg, Seattle, WA USA