[1] Univ Med Ctr Utrecht, Dept Neurol, NL-3508 GA Utrecht, Netherlands
[2] Vrije Univ Amsterdam, Med Ctr, Dept Social Med, Amsterdam, Netherlands
[3] Vrije Univ Amsterdam, Med Ctr, Inst Res Extramural Med, Amsterdam, Netherlands
[4] Univ Amsterdam, Acad Med Ctr, Dept Neurol, NL-1105 AZ Amsterdam, Netherlands