1. Department of Neurology, Instituto de Investigación Sanitaria San Carlos (IdISSC), Hospital Clínico San Carlos, Madrid, Spain
2. Department of Medicine, School of Medicine, Universidad Complutense de Madrid (UCM), Madrid, Spain
3. Department of Neurology, Hospital Universitario Quirón Madrid, Pozuelo de Alarcón, Madrid, Spain
4. Department of Neurology, Hospital Clínico Universitario de Valladolid, Valladolid, Spain
5. Department of Medicine, School of Medicine, Universidad de Valladolid (UVA), Valladolid, Spain