1. Department of Cardiology, The First Hospital of Hebei Medical University, Shijiazhuang, Hebei, China
2. Department of Cardiology, 980 Hospital of PLA Joint Logistics Support Forces, Shijiazhuang, Hebei, China
3. Department of Emergency, The First Hospital of Hebei Medical University, Shijiazhuang, Hebei, China
4. Department of Ultrasound, The First Hospital of Hebei Medical University, Shijiazhuang, Hebei, China