Collaborators: Barnes-Jewish Hospital, University of Florida, University Health Network, Toronto, University of Kansas, University of Minnesota, Sacred Heart Medical Center Springfield, Mount Sinai Hospital, New York, Cedars-Sinai Medical Center, Hopital de Chicoutimi, Hartford Hospital, Prisma Health-Upstate, Johns Hopkins University, St. Joseph's Hospital and Medical Center, Phoenix, Hopital de l'Enfant-Jesus, Milton S. Hershey Medical Center, UMass Memorial Health, NINDS Stroke Trials Network (StrokeNet), University of Arkansas, Huntington Memorial Hospital, Ochsner Health System, Montefiore Medical Center, Long Beach Memorial Medical Center, Augusta University Medical Center, Canadian Stroke Consortium (CSC), Centre Intégré de Santé et de Services Sociaux de la Montérégie-Centre, Spectrum Health Hospitals, University of Alabama at Birmingham, Froedtert Hospital, Cox Medical Center South, West Virginia University, Buffalo General Medical Center, University of Southern California, Carolinas Medical Center, Foothills Medical Centre, Scripps Health, Brigham and Women's Hospital, Swedish Medical Center, Arrowhead Regional Medical Center, Oregon Health and Science University, Fraser Health, St. Luke's Hospital, Kansas City, Missouri, Wake Forest University Health Sciences, Columbia University, Staten Island University Hospital, Tufts Medical Center, University of Utah, OSF Healthcare System, MetroHealth Medical Center, Mayo Clinic, Medical University of South Carolina, The University of Texas Health Science Center at San Antonio, McLaren Health Care, University of Louisville, St. Mary's Medical Center, North Shore University Hospital, St. Cloud Hospital, Metro Health, Michigan, Temple University, Tampa General Hospital, Baystate Medical Center, San Francisco General Hospital, University of North Carolina, Chapel Hill, University of Maryland, Baltimore, Legacy Emanuel Medical Center, University of Michigan, Allina Health System, New York Presbyterian Brooklyn Methodist Hospital, Wayne State University, Regions Hospital, OU Medical Center, University of Iowa, University of South Alabama, Eden Medical Center, Health Sciences Centre, Winnipeg, Manitoba, University of Alberta, University of Virginia, Sanford Medical Center Fargo, Central DuPage Hospital, Lehigh Valley Hospital, Weill Medical College of Cornell University, University of Nebraska, Massachusetts General Hospital, Hamilton General Hospital, Université de Sherbrooke, Kaiser Permanente, Yale University, Harborview Injury Prevention and Research Center, The Ottawa Hospital, Tulane Medical Center, The Moses H. Cone Memorial Hospital, Jackson Health System, Stanford University, Rhode Island Hospital, University of Wisconsin, Madison, Mercy San Juan Medical Center, State University of New York - Upstate Medical University, Lahey Hospital & Medical Center, Abington Memorial Hospital, NYU Langone Hospital - Brooklyn, Loyola University, St. David's HealthCare, Desert Care Network, University of Cincinnati, Baylor College of Medicine, Ohio State University, University of Vermont Medical Center, University of New Mexico, University of California, San Diego, Mercy Health Saint Mary Grand Rapids, University of California, Irvine, Thunder Bay Regional Health Sciences Centre, NYU Langone Medical Center - Tisch Hospital, Baptist Medical Center Jacksonville, University of Pittsburgh, Rush University Medical Center, University of Pennsylvania, UH, Cleveland Medical Center, Thomas Jefferson University, University of Kentucky, Intermountain Medical Center, Aurora BayCare Medical Center, Montreal Neurological Institute and Hospital, London Health Sciences Centre, University of California, San Francisco, St. Joseph's Regional Medical Center, New Jersey, York Hospital, York, PA, Banner University Medical Center, George Washington University