WEB EXCLUSIVE: Dr. Demetrius Maraganore of NorthShore on prevalence of Alzheimer’s

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CHICAGO -- Dr. Demetrius Maraganore joins WGN to discuss the prevalence of Alzheimer's disease.

This segment was filmed as a Web exclusive in conjunction with the WGN-TV special, "Unforgettable: Living with Alzheimer's," which airs Aug. 29.