1. Departments of Pediatrics and Medicine (M.I.N., T.Y., C.P., A.K., M.Y., S.-M.K., L.S., M.Z.), Mt Sinai School of Medicine, New York, New York 10029
2. Centre for Research into Circulating Fetal Nucleic Acids (Y.K.T., P.J., K.C.A.C., G.J.W.L., R.W.K.C., Y.M.L.), Li Ka Shing Institute of Health Sciences, Hong Kong
3. Department of Chemical Pathology (Y.K.T., P.J., K.C.A.C., G.J.W.L., R.W.K.C., Y.M.L.), The Chinese University of Hong Kong, Hong Kong SAR, China