White matter microstructure is altered in cognitively normal middle-aged APOE-ε4 homozygotes. Alzforum, 01 Jun 2018 Operto G, Cacciaglia R, Grau-Rivera O, Falcon C, Brugulat-Serrat A, Ródenas P, Ramos R, Morán S, Esteller M, Bargalló N…