1. Department of Cardiology, Zhejiang Province Rongjun Hospital, Jiaxing, Zhejiang 314000, P.R. China
2. Department of Internal Medicine, The Affiliated Zhongshan Hospital of Dalian University, Dalian, Liaoning 116001, P.R. China
3. Department of Cardiology, Dalian Third People's Hospital Affiliated to Dalian Medical University, Dalian, Liaoning 116200, P.R. China
4. Department of Heart Intensive Care Unit, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116011, P.R. China