1 Department of Cardiology, University of Rennes, CHU Rennes, Inserm, LTSI - UMR 1099, F-35000 Rennes, France.
2 Department of Cardiology, University of Rennes, CHU Rennes, Inserm, LTSI - UMR 1099, F-35000 Rennes, France. Electronic address: erwan.donal@chu-rennes.fr.