Cerebral Small Vessel DiseasesLeukoaraiosisBrain InfarctionStroke, LacunarLeukoencephalopathiesDementia, VascularCerebrovascular DisordersMagnetic Resonance ImagingMicrovesselsBrainNerve Fibers, MyelinatedCADASILVenulesCognition DisordersStrokeCerebrovascular CirculationImage Processing, Computer-AssistedProspective StudiesRisk FactorsNetherlandsCerebral ArteriesDementia, Multi-InfarctCohort StudiesCerebral InfarctionBasal Ganglia Cerebrovascular DiseaseBrain IschemiaBlood Vessels