1. Department of Cardiology, Amsterdam UMC, University of Amsterdam, the Netherlands (A.A.M.W.).
2. Amsterdam Cardiovascular Sciences, Heart Failure and Arrhythmias, the Netherlands (A.A.M.W.).
3. European Reference Network for Rare, Low Prevalence and Complex Diseases of the Heart (A.A.M.W., J.S.).
4. Department of Cardiology, Antwerp University Hospital, Edegem, Belgium (J.S.).