[1] United Hosp, Allina Hlth, John Nasseff Neurosci Inst, 225 North Smith Ave,Suite 500,Mail Route 65500, St Paul, MN 55102 USA
[2] Univ Florida, Coll Med, Dept Neurol, Gainesville, FL 32611 USA
[3] Univ Florida, Coll Med, Dept Radiol, Gainesville, FL 32610 USA