Weijian Huang1, Xiaohong Zhou2, Kenneth A Ellenbogen3. 1. Department of Cardiology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China. Electronic address: weijianhuang69@126.com. 2. Cardiac Rhythm Management, Medtronic, plc, Minneapolis, Minnesota. 3. Division of Cardiology, Virginia Commonwealth University Medical Center, Richmond, Virginia.