1. Department of Electrocardiogram, Wenzhou People's Hospital, Wenzhou, Zhejiang 325000, P.R. China
2. Department of Emergency Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China
3. Department of Critical Care Medicine, Wenzhou Central Hospital, Wenzhou, Zhejiang 325000, P.R. China