ABLATION OF PERI-MITRAL FLUTTER AFTER ABLATION OF LONG STANDING PERSISTENT AF: RESULTS FROM THE PROPOSE MULTICENTER STUDY - Biase, Luigi Di; Bai, Rong; Mohanty, Prasant; Russo, Antonio Dello; Casella, Michela; Pelargonio, Gemma; Themistoclakis, Sakis; Mohanty, Sanghamitra; Elayi, Claude S.; Sanchez, Javier E.; Burkhardt, David J.; Horton, Rodney; et al. (Journal of the American College of Cardiology (JACC), 2011)