Langa, Kenneth M; Okura, Toru; Plassman, Brenda L; Steffens, David C; Llewellyn, David J; Potter, Guy G. (2011).
Neuropsychiatric Symptoms and the Risk of Institutionalization and Death: The Aging, Demographics, and Memory Study. Journal of the American Geriatrics Society. 59(3), 473-481.