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Cognitive trajectories over a lifetime and AD phases. National Institute on Aging's document titled “Alzheimer's Disease: Unraveling the Mystery”. Available from: https://www.nia.nih.gov/alzheimers/publication/alzheimers_disease-unraveling-mystery/preface, accessed on August 20, 2015. [Reproduced with permission from: www.nih.gov<http://www.nia.nih.gov/>].
