1. From the Heart Failure Unit, St. Vincent’s University Hospital, Dublin, Ireland (M.B., M.K.S., I.D., K.M., M.L.); School of Medicine and Medical Science, University College Dublin, Dublin, Ireland (M.B., E.O., K.M., M.L.); School of Medicine, University College Cork, Cork, Ireland (S.M.); Centre for Cardiovascular Magnetic Resonance, Blackrock Clinic, County Dublin, Ireland (R.O.); and School of Pharmacy and Pharmaceutical Sciences, Trinity College, Dublin, Ireland (J.G.).