1. From the Division of Cardiovascular Sciences, National Heart, Lung, and Blood Institute, Bethesda, MD (J.L.F., L.S.C.); Division of Cardiovascular Disease, Mayo Clinic, Rochester, MN (B.A.B.); Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, Alberta, Canada (M.J.H.); Division of Cardiology, Duke University School of Medicine, Durham, NC (W.E.K.); Institute for Exercise and Environmental Medicine, University of Texas Southwestern Medical Center, Dallas (B.D.L.); Cardiovascular...