title: Reply.
authors.affiliation: Department of Cardiology, St. Antonius Hospital, P.O. Box 2500, 3435 CM Nieuwegein, The Netherlands. Electronic address: b.m.swinkels@hetnet.nl.
authors.forename: Ben M
authors.initials: BM
authors.lastname: Swinkels
authors.affiliation: Department of Cardiothoracic Surgery, Academic Medical Center, Amsterdam, The Netherlands.
authors.forename: Bas A
authors.initials: BA
authors.lastname: de Mol
authors.affiliation: Department of Cardiology, St. Antonius Hospital, Nieuwegein, The Netherlands.
authors.forename: Johannes C
authors.initials: JC
authors.lastname: Kelder
authors.affiliation: Department of Cardiothoracic Surgery, St. Antonius Hospital, Nieuwegein, The Netherlands.
authors.forename: Freddy E
authors.initials: FE
authors.lastname: Vermeulen
authors.affiliation: Department of Cardiology, St. Antonius Hospital, Nieuwegein, The Netherlands.
authors.forename: Jurriën M
authors.initials: JM
authors.lastname: Ten Berg