1. Department of Neurology; Aarhus University Hospital; Aarhus Denmark
2. Department of Neurology; Technical University of Dresden; Dresden Germany
3. Department of Neurology; Sheffield Teaching Hospitals NHS Foundation Trust; Sheffield UK
4. Neurology Service; Department of Medical Science and Public Health; University of Cagliari; Cagliari Italy
5. Neurology Service; University Hospital of Coimbra; Coimbra Portugal
6. Neurology; UCL Institute of Neurology; London
7. Department of Neurology; King's College London and King's College Hospital; London UK