Reisberg: I would like to summarize very briefly. In the Consortium to Establish a Registry for Alzheimer's Disease (CERAD) study, one third of patients with Alzheimer's disease (AD) had concomitant cerebral vascular disease. This finding supports the original work of Tomlinson and Blessed, who indicated a similar percentage of patients with AD also had mixed cerebral vascular disease upon neuropathologic examination.