1 Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, Netherlands. Electronic address: j.p.greving@umcutrecht.nl.
2 Department of Neurology, Leiden University Medical Center, Leiden, Netherlands.
3 Department of Neurology and Neurosurgery, Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands.
4 Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, Netherlands; Department of Neurology and Neurosurgery, Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, Netherlands.