1. Department of Neurology, University of L'Aquila, L'Aquila, Italy
2. Neurology Service, Hospital Clinic, Villarroel, Barcelona, Spain
3. Department of Neurology, Mont-Godinne University Hospital, Yvoir, Belgium
4. Service of Vascular Neurology, Hopital Roger Salengro, Lille, France
5. Department of Neurology, Johannes Wesling Klinikum Minden, Minden, Germany
6. Department of Neurology, Technical University of Munich, Munich, Germany
7. Northern Vascular Unit, Freeman Hospital and Newcastle University, Newcastle upon Tyne, UK
8. Department of Neurology, University of Duisburg-Essen, Essen, Germany