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FILE - R. Scott Turner, Professor of Neurology and Director of the Memory Disorder Center at Georgetown University Hospital, points to PET scan results that are part of a study on Alzheimer's disease at Georgetown University Hospital, in Washington, May 19, 2015. (AP Photo/Evan Vucci, File)

FILE - R. Scott Turner, Professor of Neurology and Director of the Memory Disorder Center at Georgetown University Hospital, points to PET scan results that are part of a study on Alzheimer's disease at Georgetown University Hospital, in Washington, May 19, 2015. (AP Photo/Evan Vucci, File)

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