1. Smidt Heart Institute at Cedars-Sinai Medical Center, Los Angeles, CA (R.G.V., C.A.B., K.L., N.B.M., M.R., F.R.).
2. Department of Biomathematics at University of California, Los Angeles, David Geffen School of Medicine (N.L., L.C.C., R.M.E.).
3. Kaiser-Permanente, Los Angeles, CA (J.H., J.B.).