[1] W Virginia Univ, Hlth Sci Ctr, Dept Neurol, Morgantown, WV 26506 USA
[2] W Virginia Univ, Sch Med, Dept Neurol, Stroke Team, Morgantown, WV 26506 USA
[3] W Virginia Univ, Dept Stat, Morgantown, WV 26506 USA
[4] W Virginia Univ, Dept Community Med, Morgantown, WV 26506 USA