Wetaskiwin Lung Laboratory, Wetaskiwin, Alberta, Canada
Lion's Gate Hospital, North Vancouver, British Columbia, Canada
University of Alberta Hospital, Edmonton, Alberta, Canada
University of Alberta Hospital, Edmonton, Alberta, Canada
Ohio State University, Division of Stroke, Columbus, Ohio, United States
Marshfield Clinic, Department of Neurology, Marshfield, Wisconsin, United States
Metrohealth Medical Center, Cleveland, Ohio, United States