1. From the State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (Xuanyu Liu, W.C., W.L., Y.F., B.M., B.H., Xuewen Liu, S.H., Z.Z.)
2. Beijing Key Laboratory for Molecular Diagnostics of Cardiovascular Diseases, Center of Laboratory Medicine, China (Xuanyu Liu, W.C., W.L., Y.F., Z.Z.)
3. Department of Pediatrics, Stanford University School of Medicine, CA (J.R.P.)
4. Department of Echocardiography, Fuwai Hospital, Beijing, China (K.P.).