Retraction Statement: 'Safety and Feasibility of Leadless Pacemaker Compared with Traditional Transvenous Single-Lead Pacemaker: An Animal Study' by Lan T, Wang H, Sun X, Zhao X, Yang G, Chen K, and Zheng X...Lan T, Wang H, Sun X, et al. Safety and feasibility of leadless pacemaker compared with traditional transvenous single-lead pacemaker: An animal study. Pacing Clin Electrophysiol 2015;