The effect of TOMM40 poly-T length on gray matter volume and cognition in middle-aged persons with APOE 3/3 genotype Johnson SC, Rue AL, Hermann BP, Xu G, Koscik RL, Jonaitis EM, Bendlin BB, Roses AD, Saunders AM, Lutz MW, Asthana S, Green RC, Sager MA. Alzheimer's and Dementia July 2011 Open .pdf