1. From the Smidt Heart Institute at Cedars–Sinai Medical Center (R.G.V., K.L., C.B., E.M., M.R., B.H., D.F.-D., N.M., A.E.R.), the Department of Biomathematics, David Geffen School of Medicine, University of California, Los Angeles (N.L., R.M.E.), and Kaiser Permanente (J.H., J.B.) — all in Los Angeles.