1 North Bristol NHS trust and University of Bristol, Bristol, UK. Electronic address: [email protected].
2 Department of Vascular Surgery, Ambroise Paré University Hospital, Assistance Publique-Hôpitaux de Paris, Boulogne-Billancourt, France.
3 Department of Neurology, Tallaght University Hospital/Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital (AMNCH), Tallaght, Dublin, Ireland; Academic Unit of Neurology, School of Medicine, Trinity College Dublin, Ireland.