1 Neurology, Centro Hospitalar Universitário de São João, Porto, Portugal.
2 Department of Clinical Neurosciences and Mental Health, Faculty of Medicine, University of Porto, Porto, Portugal.
3 Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen Medical Centre, Nijmegen, Netherlands.
4 Department of Internal Medicine, Radboud University Medical Centre, Nijmegen, Netherlands.
5 Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen Medical Centre, Nijmegen, Netherlands bas.bloem@radboudumc.nl.