1. From the Department of Cardiology (L.Z., Z.S., X.Z., S.L., J.L., C.X., Y.S.), Shengjing Hospital of China Medical University, Shenyang, PR China; the Heart, Lung and Blood Vessel Center (J.L., D.H.), Tongji University, Shanghai, PR China; and the School of Vocational Education (R.Z.), Shenyang Medical College, Shenyang, PR China.