Left Atrial Appendage Tip: An Unusual Site of Successful Ablation After Failed Endocardial and Epicardial Mapping and Ablation. - DI BIASE, LUIGI; SCHWEIKERT, ROBERT A.; SALIBA, WALID I.; HORTON, RODNEY; HONGO, RICHARD; BEHEIRY, SALWA; BURKHARDT, DAVID J.; NATALE, ANDREA (Journal of Cardiovascular Electrophysiology, 2010)