1. Department of Cardiology, The Third Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310000, P.R. China
2. Department of Cardiology, Ezhou Central Hospital, Ezhou, Hubei 436000, P.R. China
3. Department of General Practice, The Third Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310000, P.R. China