1. Neurology Department, Cruces University Hospital, Barakaldo, Bizkaia, Spain and Neuroimmunology Program, Service of Neurology, Hospital Clinic, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Universitat de Barcelona, Barcelona, Spain
2. Service of Neurology, Hospital Clínic, Villarroel 170, 08036 Barcelona, Spain
3. Institut d’Investigacions Biomèdiques August Pi I Sunyer (IDIBAPS), Barcelona, Spain
4. Neuroimmunology Program, Service of Neurology, Hospital Clinic, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Universitat de Barcelona, Barcelona, Spain