The Objective Physical Activity and Cardiovascular Disease Health in Older Women (OPACH) Study by Andrea Z. LaCroix, Eileen Rillamas-Sun, David Buchner, Kelly R. Evenson, Chongzhi Di, I-Min Lee, Steve Marshall, Michael J. LaMonte, Julie Hunt, Lesley Fels Tinker, Marcia Stefanick, Cora E. Lewis, John Bellettiere, Amy H. Herring

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