University of Chicago - Medical Center, Rowan University - Cooper Medical School, Boston University - Boston Medical Center, University of Pittsburgh Medical Center, University of Pittsburgh Medical Center, 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, 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