Figure 3From: Vascular risk factors and Alzheimer's disease: are these risk factors for plaques and tangles or for concomitant vascular pathology that increases the likelihood of dementia? An evidence-based review Sampling frame for a longitudinal aging cohort. An aging cohort study includes normal controls and subjects with Alzheimer's disease (AD) and stroke. The severity of arteriosclerosis and vascular risk factors are randomly sampled and representative for each group.Back to article page