1 Department of Neurology and Neurosurgery, Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, The Netherlands.
2 Department of Genetics, Center for Molecular Medicine, University Medical Center Utrecht, Utrecht, The Netherlands.
3 Department of Epidemiology, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands.
4 Department of Neurology and Neurosurgery, Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, The Netherlands. ij.m.ruigrok@umcutrecht.nl.
5 The Dutch Parelsnoer Institute-Cerebrovascular accident (CVA) Study Group, Utrecht, The Netherlands. ij.m.ruigrok@umcutrecht.nl.