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Location of focal sources and rotors in patients using FIRM mapping. (From Spitzer SG, Károlyi L, Rämmler C, Scharfe F, Weinmann T, Zieschank M, et al. Treatment of Recurrent Non-Paroxysmal Atrial Fibrillation Using Focal Impulse and Rotor Mapping (FIRM) -Guided Rotor Ablation : Early Recurrence and Long-Term Outcomes Short title : FIRM ablation outcomes for recurrent non-paroxysmal AF. J Cardiovasc Electrophysiol. 2017;1–30; with permission.)
