Sites With Small Impedance Decrease During Catheter Ablation for Atrial Fibrillation Are Associated With Recovery of Pulmonary Vein Conduction. - Chinitz JS; Kapur S; Barbhaiya C; Kumar S; John R; Epstein LM; Tedrow U; Stevenson WG; Michaud GF (Journal of cardiovascular electrophysiology, 2016)