1. Department of Neurology; Academic Medical Center; Amsterdam the Netherlands
2. Department of Neurology; Helsinki University Central Hospital; Helsinki Finland
3. Institute of Neuroscience and Physiology; Sahlgrenska Academy at University of Gothenburg; Gothenburg Sweden
4. Department of Neurology; Sahlgrenska University Hospital; Gothenburg Sweden
5. Vascular Medicine; Academic Medical Center; Amsterdam the Netherlands
6. Department of Clinical Epidemiology; Leiden University Medical Center; Amsterdam the Netherlands