1. Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650000, P.R. China
2. Department of Emergency, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650000, P.R. China
3. Department of Cardiology, Wuhan Puren Hospital, Wuhan, Hubei 430000, P.R. China
4. Department of Cardiology, Kunming Calmette International Hospital, Kunming, Yunnan 650000, P.R. China