[1] Henry Ford Hlth Sci Ctr, Dept Neurol, Detroit, MI USA
[2] Henry Ford Hlth Sci Ctr, Dept Biostat & Res Epidemiol, Detroit, MI USA
[3] Henry Ford Hlth Sci Ctr, Dept Emergency Med, Detroit, MI USA
[4] Henry Ford Hlth Sci Ctr, Dept Radiol, Detroit, MI USA
[5] JFK Med Ctr, New Jersey Neurosci Inst, Edison, NJ USA
[6] Oakland Univ, Dept Med Phys, Rochester, MI 48063 USA