1. From the Division of Cardiac Surgery (M.A.S.A., B.X., L.Z., X.-X.H., F.-J.C., H.-B.C., J.-P.Y., Y.-Q.X., W.-B.Z., B.-Y.T., Z.-P.W., J.-S.O.), The Key Laboratory of Assisted Circulation, Ministry of Health (M.A.S.A., B.X., L.Z., X.-X.H., F.-J.C., H.-B.C., J.-P.Y., Y.-Q.X., W.-B.Z., B.-Y.T., Z.-P.W., J.-S.O.), and Department of Ultrasound (F.-J.Y., D.-H.L.), The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, P.R. China; and Department of Medical Statistics and Epidemiology, School of...