1. Department of Cardiology, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, P.R.�China
2. The Central Laboratory, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, P.R.�China
3. Department of Cardiology, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China