1. Department of Cardiology, Jining No. 1 People's Hospital, Jining, Shandong 273200, P.R. China
2. Department of Cardiology, Affiliated Hospital of Jining Medical University, Jining, Shandong 272029, P.R. China
3. Department of Emergency, Affiliated Hospital of Jining Medical University, Jining, Shandong 272029, P.R. China