P1173Repeated ablation of atrial fibrillation with ultra-high density mapping: workflow and validation in clinical practice. Insights from the TRUE HD study. (19th March 2018) - Garcia-Bolao, J I; Mcelderry, T; Weiner, S; Jais, P; Wong, T; Maddox, W; Ji, S Y; Sacher, F; Willems, S; Mounsey, J; Maury, P; Bollmann, A; et al.