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Flowchart of study population. 1. Reasons for non-participation: 15 not willing to participate; 10 Morrow myectomy/Percutaneous transluminal septal myocardial ablation; 7 ICD or pacemaker; 5 could not be contacted; 5 claustrophobia; 12 other. 2. Reasons for inadequate CMR imaging data: 1 claustrophobia; 1 inadequate CMR image quality
