1. Department of Cardiology, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning 121000, P.R. China
2. Department of Cardiology, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
3. Department of Geriatrics, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning 121000 P.R. China