Response to letter regarding article, 'wolff-Parkinson-white syndrome in the era of catheter ablation: insights from a registry study of 2169 patients'. - Pappone, Carlo; Vicedomini, Gabriele; Manguso, Francesco; Saviano, Massimo; Baldi, Mario; Pappone, Alessia; Ciaccio, Cristiano; Giannelli, Luigi; Ionescu, Bogdan; Petretta, Andrea; Vitale, Raffaele; Cuko, Amarild; et al. (Circulation, 2015)