1. Department of Cardiology, Tianjin Baodi Hospital, Baodi Clinical College of Tianjin Medical University, Tianjin 301800, P.R. China
2. Department of Clinical Laboratory, Tianjin Baodi Hospital, Baodi Clinical College of Tianjin Medical University, Tianjin 301800, P.R. China
3. Department of Cardiology, Shenyang Fourth People's Hospital, Shenyang, Liaoning 110031, P.R. China
4. Department of Cardiovascular Medicine, Tianjin Chest Hospital, Tianjin 300202, P.R. China
5. Department of Nursing, Tianjin Baodi Hospital, Baodi Clinical College of Tianjin Medical University, Tianjin 301800, P.R. China