1. From the Cedars-Sinai Heart Institute, Los Angeles, CA (C.S.); Ohio Heart and Vascular Center, Cincinnati (T.C.); Indiana University School of Medicine, Indianapolis (M.D.); Faculty of Medicine University of Calgary, Calgary, AB, Canada (A.M.G.); and Medtronic, Inc, Mounds View, MN (X.Z., A.A., R.N.G.).