STUDY LIMITATIONS
We have several limitations in the present study. First, the study has the inherent limitations of a non-randomized retrospective study from a single-center. However, we used propensity score-matched analysis to compare different ablation methods, therefore patients’ backgrounds were statistically adjusted. Second, we used an irrigated ablation catheter without contact force in this study. Contact force guide ablation makes it possible to more firmly create transmural lesion for PVI and linear ablation compared with conventional ablation catheter, which may affect the results. Third, as mentioned in discussion section, EGM-guided ablation is associated with an element of subjectivity. However only one experienced operator performed the procedure in this population, therefore the operator bias was limited.