1 From the Division of Neurology (G.C.J.), University of Alberta, Edmonton, Canada; and Department of Neurology (T.D.), Jagiellonian University Medical College, Krakow, Poland. glenj@ualberta.ca.
2 From the Division of Neurology (G.C.J.), University of Alberta, Edmonton, Canada; and Department of Neurology (T.D.), Jagiellonian University Medical College, Krakow, Poland.