Write a research essay over Alzheimer’s disease.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2695165/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5830188/ https://www.brightfocus.org/alzheimers/article/three-stages-alzheimers-disease https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0134750 https://www.alz.org/alzheimers-dementia/what-is-alzheimers