1. Department of Autoimmune Diseases, Hospital Clínic, Barcelona, Catalonia, Spain
2. Department of Autoimmune Diseases, Hospital Clínic, Barcelona, Catalonia, Spain,
3. Department of Neurology, Hospital Verge de Meritxell, Andorra la Vella, Andorra
4. Department of Internal Medicine, Hospital Verge de Meritxell, Andorra la Vella, Andorra