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Figure 1 Study profile. Number of patients active in the study at each follow-up between inclusion and the 12 months in the sinus rhythm (left side) and atrial fibrillation (right side) groups. The reasons for study exits during the crossover phase of the study have been published elsewhere (9). BiV = biventricular; ICD = implantable cardioverter defibrillator; VVIR = rate adaptive ventricular inhibited pacing.