P2‐271: THE EFFECT OF AFRICAN AMERICAN RACE ON NEUROBEHAVIORAL OUTCOMES, STRUCTURAL MRI INDICES, AND CEREBROSPINAL FLUID CONCENTRATIONS OF TAU AND Aβ IN FORMER NATIONAL FOOTBALL LEAGUE PLAYERS. (1st July 2019) - Mariani, Megan; Alosco, Michael L.; Tripodis, Yorghos; Conneely, Shannon; Martin, Brett M.; Singh, Bhupinder; Cantu, Robert; Koerte, Inga; Lin, Alexander P.; Shenton, Martha; Stern, Robert A.