Steffenhagen Nikolai, Hill Michael D, Poppe Alexandre Y, Buchan Alastair M, Coutts Shelagh B
Calgary Stroke Program, Department of Clinical Neurosciences, University of Calgary, Calgary, Alta., Canada.
Cerebrovasc Dis. 2009;28(2):201-2. doi: 10.1159/000226579. Epub 2009 Jun 30.