Although Alzheimer's disease accounts for 60-70 percent of cases of dementia, other disorders that cause dementia include: Vascular dementia, Parkinson's disease, dementia with Lewy Bodies and Frontotemporal dementia.
In the early stages of a disease, there can be some clear differences ..."
http://www.mayoclinic.org/alzheimers-disease-and-dementia/expert-blog/bgp-20055941
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