1. Department of Cardiology, The First Affiliated Hospital of China Medical University, Heping, Shenyang, Liaoning 110001, P.R. China
2. Department of Hepatobiliary Surgery, People's Hospital of China Medical University, Liaoning Provincial People's Hospital, Shenyang, Liaoning 110016, P.R. China
3. Department of Geriatric Cardiology, The First Affiliated Hospital of China Medical University, Heping, Shenyang, Liaoning 110001, P.R. China