The purpose of this study is to obtain data regarding the left ventricular mass (LVM) regression 6 months after the implant of an SJM Epic™ and SJM Epic™ Supra valve by comparing LVM regression measured with magnetic resonance imaging (MRI) to LVM regression measured with echocardiography (2-dimensional [2D] mandatory; 3-dimensional [3D] in sites where the technology is available).