Johns Hopkins University, Johns Hopkins University - Department of Radiology, Louisiana State University, Baton Rouge, Louisiana State University, Baton Rouge, Thomas Jefferson University, University of Massachusetts Worcester - Department of Neurology, Rutgers, The State University of New Jersey - New Jersey Medical School, University of Massachusetts Memorial Medical Center, Rowan University - Cooper Medical School, Mayo Clinic, Henri-Mondor/Albert-Chenevier Hospital, National University of Singapore (NUS) - National University Hospital, Stanford University - Stanford University Medical Center, Harvard University - Harvard Medical School, University of Toronto - Saint Michael's Hospital, Harvard University - Brigham and Women's Hospital, University Hospital of Limoges, University of Hamburg - University Medical Center Hamburg-Eppendorf, McGovern Medical School - Department of Neurology, Yeshiva University - Montefiore Medical Center, University of Massachusetts Worcester - UMass Chan Medical School, Lübeck GmbH, Oregon Health and Science University, Bordeaux University Hospital - CHU Bordeaux, University of Florence - Azienda Ospedaliero Universitaria Careggi, Universidade do Porto - Centro Hospitalar Universitário do Porto, University of Cincinnati - University of Cincinnati Medical Center, University of Montpellier - Gui-de-Chauliac Hospital, University of Toronto - Saint Michael's Hospital, University of Toronto - Saint Michael's Hospital, Tokyo Metropolitan Tama Medical Center, University of Southern California - Keck School of Medicine, Thomas Jefferson University, New York Medical College - Westchester Medical Center, Sorbonne University - Interventional Neuroradiology Unit, University of Chicago - Medical Center, Boston University - Department of Neurology, Universidade do Porto - Centro Hospitalar Universitário do Porto, Yeshiva University - Montefiore Medical Center, Yeshiva University - Montefiore Medical Center, Cedars Sinai Medical Center - Department of Neurosurgery, Heidelberg University - University Hospital Heidelberg, University of Montpellier - Gui-de-Chauliac Hospital, University of Lorraine - INSERM U1254, University Hospital Münster, Harvard University - Brigham and Women's Hospital, Paracelsus Medical University Salzburg, Rowan University - Cooper Medical School, University of California, Los Angeles (UCLA) - Department of Neurology and Comprehensive Stroke Center, Fondazione Policlinico Universitario A. Gemelli IRCCS, Fondazione Policlinico Universitario A. Gemelli IRCCS, Civil Hospital Marie Curie, University of Amsterdam - University Medical Center, Hôpitaux de Paris (AP-HP) - Hôpital Henri Mondor, Université Libre de Bruxelles (ULB) - Erasme University Hospital, Harvard University - Massachusetts General Hospital, University of Toronto - Saint Michael's Hospital, Université Libre de Bruxelles (ULB) - Erasme University Hospital and Harvard University - Massachusetts General Hospital

University of Chicago - Medical Center, Rowan University - Cooper Medical School, Boston University - Boston Medical Center, University of Pittsburgh - Medical Center (UPMC), University of Pittsburgh - Medical Center (UPMC), Helsinki University Hospital, Ludwigshafen Medical Center, Rowan University - Cooper Medical School, KU Leuven - University Hospitals Leuven, Dresden University of Technology - University Clinic Carl Gustav Carus, Hospital Vall D’Hebron, Boston University - Boston Medical Center, Centro Hospitalar de Lisboa Ocidental - Department of Neurology, University of Pittsburgh - Medical Center (UPMC), National Hospital Organization Osaka National Hospital, Emory University - Grady Memorial Hospital, Hospital Vall D’Hebron, Technical University of Dresden - Institute for Immunology, Emory University - Grady Memorial Hospital, KU Leuven - Leuven Research Institute for Neuroscience and Disease (LIND), National Cerebral and Cardiovascular Centre, Helsinki University Hospital, Civil Hospital Marie Curie, Civil Hospital Marie Curie, Dresden University of Technology - University Clinic Carl Gustav Carus, University of Lille I - Centre Hospitalier Universitaire de Lille, University of Lille I - Centre Hospitalier Universitaire de Lille, Centro Hospitalar de Lisboa Ocidental, University of Iowa - Department of Neurology, McGovern Medical School - Department of Neurology, University of Cambridge - Department of Clinical Neurosciences, KU Leuven - University Hospitals Leuven, University of Bern - Institute of Diagnostic and Interventional Neuroradiology, McGovern Medical School - Department of Neurology, Helsinki University Hospital, Centro Hospitalar de Lisboa Ocidental, University of Toledo - ProMedica Toledo Hospital, University of Toledo - ProMedica Toledo Hospital, University of Toledo, University of Iowa - University of Iowa Hospitals & Clinics, University of Massachusetts Worcester - UMass Chan Medical School, University of Bern - Institute of Diagnostic and Interventional Neuroradiology, Boston University - Boston Medical Center, Brown University - Rhode Island Hospital, University of Montreal - University of Montreal Health Centre, Boston University - Boston Medical Center, State University of New York Upstate Medical University, Heidelberg University - University Hospital Heidelberg, Heidelberg University - University Hospital Heidelberg, Heidelberg University - University Hospital Heidelberg, Helsinki University Central Hospital - Division of Neurocritical Care & Emergency Neurology, St Vincent Mercy Hospital - Neuroscience Institute, Brown University - Rhode Island Hospital, University of Lausanne - Lausanne University Hospital, University of Lausanne - Lausanne University Hospital, University of Montreal - University of Montreal Health Centre, Hyogo Medical University, Hyogo College of Medicine, University of Montreal - University of Montreal Health Centre and Boston University - Department of Neurology