1. From the Department of Medicine, Mayo Clinic, Rochester, MN (H.H.C., O.F.A.E., M.M.R.); Duke Clinical Research Institute, Durham, NC (K.J.A., A.F.H., K.L.L.); Department of Medicine, Brigham and Women’s Hospital, Boston, MA (M.M.G, E.B.); Department of Medicine, University of Minnesota, Minneapolis, MN (B.A.B.); and Duke University School of Medicine and Duke Heart Center, Durham, NC (G.M.F).