title: Reply to Koestenberger and Ravekes.
authors.affiliation: Department of Paediatric Cardiology, Leiden University Medical Center, Leiden, Netherlands.
authors.forename: Liselotte M
authors.initials: LM
authors.lastname: Klitsie
authors.forename: Arno A W
authors.initials: AA
authors.lastname: Roest
authors.forename: Nico A
authors.initials: NA
authors.lastname: Blom
authors.forename: Arend D J
authors.initials: AD
authors.lastname: Ten Harkel
mesh_terms: D005260:Female; D006321:Heart / Q000502:physiology*; D006345:Heart Septal Defects, Ventricular / Q000601:surgery*; D006801:Humans; D008297:Male
keywords: Cardiopulmonary bypass; Child; Echocardiography; Heart septal defects; Tissue Doppler imaging; Ventricular