Optimal Catheter Ablation Strategy for Patients with Persistent Atrial Fibrillation and Heart Failure: A Retrospective Study oleh Cheng-ming Ma, Ye-jian He, Wen-wen Li, Hua-min Tang, Shi-yu Dai, Xiao-meng Yin, Xian-jie Xiao, Yun-long Xia, Lian-jun Gao, Yuan-jun Sun, Zhong-zhen Wang, Rong-feng Zhang