[1] Univ Iowa Hosp & Clin, Dept Neurol, Iowa City, IA USA
[2] Univ Iowa Hosp & Clin, Inst Clin & Translat Sci, Iowa City, IA USA
[3] Univ Iowa Hosp & Clin, Dept Radiol, Iowa City, IA USA
[4] Univ Iowa Hosp & Clin, Dept Neurosurg, Iowa City, IA USA
[5] Univ Texas Hlth Sci Ctr Houston, Dept Neurosurg, Houston, TX USA
[6] Univ Virginia Hlth Syst, Dept Neurosurg, Charlottesville, VA USA
[7] Univ Washington, Dept Neurosurg, Seattle, WA USA
[8] Washington Univ, Dept Neurosurg, Sch Med St Louis, St Louis, MO USA
[9] Washington Univ, Mallinckrodt Inst Radiol, Sch Med St Louis, St Louis, MO USA
[10] Mayo Clin Hosp, Dept Neurosurg, Rochester, MN USA
[11] Mayo Clin Hosp, Dept Radiol, Rochester, MN USA
[12] Univ Hosp Southampton, NHS Fdn Trust, Dept Neurosurg, Southampton, England
[13] Mayo Clin, Dept Neurosurg, Jacksonville, FL USA
[14] Univ Florida, Dept Neurosurg, Gainesville, FL USA
[15] Univ Pittsburgh, Dept Neurosurg, Med Ctr Hlth Syst, Pittsburgh, PA USA
[16] Univ Illinois, Dept Neurosurg, Chicago, IL USA
[17] Univ Miami, Dept Neurosurg, Coral Gables, FL USA
[18] Univ Groningen, Dept Neurosurg, Groningen, Netherlands
[19] Tokushima Univ Hosp, Dept Neurosurg, Tokushima, Japan
[20] Univ Calif San Francisco, Dept Neurosurg, San Francisco, CA USA
[21] Brigham & Womens Hosp, Dept Neurosurg, Boston, MA USA
[22] Case Western Reserve Univ, Univ Hosp Cleveland Med Ctr, Dept Neurosurg, Sch Med, Cleveland, OH USA
[23] Univ Iowa, Dept Neurol Neurosurg & Radiol, 200 Hawkins Dr, Iowa City, IA 52246 USA