1 Section of Pacing and Electrophysiology, Division of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, China.
2 Department of Cardiology, Qinghai Province Hospital, The Affiliated Hospital of Qinghai University, Xining, Qinghai 810007, China.
3 Department of Cardiology, Xuzhou Central Hospital, The Affiliated Xuzhou Hospital of Nanjing Medical University, Jiefang Xuzhou, Jiangsu 221009, China.