[P3–242]: PLASMA TOTAL TAU, COGNITIVE DECLINE, AND RISK OF MILD COGNITIVE IMPAIRMENT IN THE MAYO CLINIC STUDY ON AGING. (1st July 2017) - Mielke, Michelle M.; Hagen, Clinton E.; Wennberg, Alexandra M.V.; Airey, David C.; Savica, Rodolfo; Knopman, David S.; Machulda, Mary M.; Roberts, Rosebud O.; Lowe, Val; Jack, Clifford R.; Petersen, Ronald C.; Dage, Jeffrey L.