1. Peking University Institute of Hematology, Peking University People’s Hospital, Beijing, China (Z.-Y.A.).
2. Department of Electrocardiography, The Sixth Affiliated Hospital of Guangzhou Medical University, Qingyuan People's Hospital, China (D.P.).
3. ECG Center, Qidong People’s Hospital/Affiliated Qidong Hospital of Nantong University, Jiangsu, China (Y.-J.S.).