1 From the Department of Medicine, Stanford University, CA (J.A.B.Z., A.J.R., S.M.N.); and Imperial Centre for Cardiac Engineering, Electrocardiomaths Programme, Imperial College London, United Kingdom (J.A.B.Z.).
2 From the Department of Medicine, Stanford University, CA (J.A.B.Z., A.J.R., S.M.N.); and Imperial Centre for Cardiac Engineering, Electrocardiomaths Programme, Imperial College London, United Kingdom (J.A.B.Z.). sanjiv1@stanford.edu.