1. Department of Clinical Neuroscience Institute of Neuroscience and Physiology Sahlgrenska Academy at University of Gothenburg Gothenburg Sweden
2. Department of Neurology Sahlgrenska University Hospital Gothenburg Sweden
3. Diagnostic and Interventional Neuroradiology Sahlgrenska University Hospital Gothenburg Västra Götaland County Sweden
4. Department of Radiology Institute of Clinical Sciences Sahlgrenska Academy at University of Gothenburg Gothenburg Sweden
5. Department of Neurology Helsinki University Hospital and University of Helsinki Helsinki Finland
6. National Institute of Neurology Neurosurgery Manuel Velasco Suarez Mexico‐City Mexico
7. Department of Neurology Inselspital Bern University Hospital and University of Bern Bern Switzerland
8. Department of Neurology Amsterdam University Medical Centers, AMC Amsterdam The Netherlands
9. Department of Neurology Sina Hospital Hamadan University of Medical Science Hamadan Iran
10. The Balfour Hospital National Health Service Orkney Kirkwall Orkney UK
11. Department of Neurology Wellington Regional Hospital, Capital and Coast District Health Board Wellington New Zealand
12. Department of Medicine University of Otago Dunedin New Zealand
13. Division of Neuroscience and Experimental Psychology School of Biological Sciences University of Manchester Manchester UK
14. Department of Neurology Royal Prince Alfred Hospital University of Sydney Sydney New South Wales Australia
15. Department of Neurology University of Virginia Health System Charlottesville Virginia USA
16. Inselspital University Institute for Diagnostic and Interventional Neuroradiology Bern Switzerland
17. John Hunter Hospital University of Newcastle and Hunter Medical Research Institute Newcastle New South Wales Australia
18. Department of Diagnostic and Therapeutic Neuroradiology Centre Hospitalier Universitaire de Toulouse Toulouse France
19. Department of Neurology South Australian Medical Research Institute Royal Adelaide Hospital University of Adelaide Adelaide Australia