Risk of Alzheimer disease is associated with parental age among apolipoprotein E4 heterozygotes

Farrer LA, Cupples LA, Kukull WA, Volicer L, Wells JM, Kurz A, Green RC, Chui H, Duara R, Auerbach SA, Larson E, Lautenschlager N, Wolf PA, D'Agostino R, Ordovas J, Schaefer E, Growdon J, Haines J.