P2‐604: RISK REDUCTION IN ALZHEIMER'S DISEASE (RRAD): RATIONALE AND METHODS FOR A MULTICENTER CLINICAL TRIAL ASSESSING EXERCISE AND INTENSIVE VASCULAR RISK REDUCTION FOR THE PREVENTION OF DEMENTIA. (1st July 2019) - Kerwin, Diana R.; Zhang, Rong; Vidoni, Eric D.; Binder, Ellen F.; Burns, Jeffrey M.; Cullum, Munro; Gahan, William; Keller, Jeffrey N.; Hynan, Linda; Rossetti, Heidi; Stowe, Ann; Vongpatanasin, Wanpen; et al.