1. From Department of Pediatrics, Aarhus University Hospital, Denmark (N.B.M., T.B.H., P.A., C.C.B., J.R.O.); Centre for Rare Diseases, Aarhus University Hospital, Denmark (N.B.M., P.A., J.R.O.); Perinatal Epidemiology Research Unit, Aarhus University Hospital, Denmark (N.B.M., T.B.H., C.C.B.); Division of Cardiothoracic Surgery, The Children’s Hospital of Philadelphia, PA (J.W.G.); and Department of Cardiothoracic Surgery, Aarhus University Hospital, Denmark (V.H.).