Incorrect statistic. The article “Treatment of Alzheimer Disease” (June 15, 2011, p. 1403) incorrectly listed the disease prevalence of Alzheimer disease as one-third of Americans older than 85 years rather than one-half in the first sentence of the abstract (p. 1403). The sentence should have read, “Alzheimer disease is the most common form of dementia, affecting nearly one-half of Americans older than 85 years.” The online version of this article has been corrected.