1 Departments of Neuroradiology (SdC, CR) and Neurology (AC, DF), Centro Hospitalar Universitário de São João, Porto, Portugal; Department of Clinical Neurosciences and Mental Health (AC, DF), Faculty of Medicine, University of Porto, Porto, Portugal; Department of Ophtalmology (MR), Centro Hospitalar Universitário de São João, Porto, Portugal; and Unit of Pharmacology and Therapeutics (MR), Department of Biomedicine, Faculty of Medicine of Porto University, Porto, Portugal.