title: Reply to the editor.
authors.affiliation: Department of Pediatric Cardiology, Leiden University Medical Center, Leiden, The Netherlands.
authors.forename: Liselotte M
authors.initials: LM
authors.lastname: Klitsie
authors.affiliation: Department of Pediatric Cardiology, Leiden University Medical Center, Leiden, The Netherlands.
authors.forename: Arno A W
authors.initials: AA
authors.lastname: Roest
authors.affiliation: Department of Pediatric Cardiology, Leiden University Medical Center, Leiden, The Netherlands.
authors.forename: Nico A
authors.initials: NA
authors.lastname: Blom
authors.affiliation: Department of Pediatric Cardiology, Leiden University Medical Center, Leiden, The Netherlands.
authors.forename: Arend D J
authors.initials: AD
authors.lastname: Ten Harkel
mesh_terms: D006348:Cardiac Surgical Procedures; D005260:Female; D006801:Humans; D008297:Male; D014188:Transposition of Great Vessels / Q000601:surgery*; D016277:Ventricular Function, Left; D016278:Ventricular Function, Right