Exit Mapping to Characterize Sites of Residual Pulmonary Vein Conduction After Failed First‐Pass Isolation With Radiofrequency Ablation of Atrial Fibrillation - Han A. Li; Ruina Zhang; Ari G. Mandler; Steven M. Markowitz; James E. Ip; Christopher F. Liu; George Thomas; Bruce B. Lerman; Jim W. Cheung (Journal of the American Heart Association: Cardiovascular and Cerebrovascular Disease)