Wang H, Odegaard A, Thyagarajan B, Hayes J, Cruz KS, Derosiers MF, Tyas SL, Gross MD. Blood folate is associated with asymptomatic or partially symptomatic Alzheimer's disease in the Nun study. J Alzheimers Dis. 2012;28(3):637–45. doi: 10.3233/jad-2011-111271. PMID: 22064069.