Kremen WS, Jak AJ, Panizzon MS, Spoon KM, Franz CE, Thompson WK, Jacobson KC, Vasilopoulos T, Vuoksimaa E, Xian H, Toomey R, Lyons MJ. Early identification and heritability of mild cognitive impairment. Int J Epidemiol. 2014 Apr; 43(2):600-10.