1. From the Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, United Kingdom (A.K., I.A.G., O.J.K., R.C.M., F.L.B., G.L.S.); Department of Bioengineering, Kings College London, London, United Kingdom (M.B.); Centre de Recherche Cardio-Thoracique, L’Institut de rythmologie et modélisation cardiaque, Université de Bordeaux, Bordeaux, France (O.B.); and School of Physics, Georgia Institute of Technology, Atlanta, GA (F.H.F.).