1 Department of Radiology University of Cincinnati Academic Health Center University Hospital Cincinnati, Ohio.
2 University of California, Los Angeles Stroke Center Los Angeles, California.
3 Calgary Stroke Program Department of Clinical Neurosciences, Medicine Community Health Sciences, Hotchkiss Brain Institute University of Calgary, Foothills Hospital Calgary, Alberta, Canada.
4 Department of Neuroradiology Dresden University Stroke Center Universitätsklinikum Carl Gustav Carusan de Technischen Universität Dresden Dresden, Germany.
5 Department of Radiology and Clinical Neurosciences University of Calgary Calgary, Alberta, Canada.
6 Department of Neurology University of Cincinnati Academic Health Center Cincinnati, Ohio.