title: Letters to the editor.
authors.affiliation: Departments of Surgery and Cardiology, University Medical Center, University of Groningen, Groningen, the Netherlands.
authors.forename: Mathijs
authors.initials: M
authors.lastname: Vogelzang
authors.forename: Johanna M M
authors.initials: JM
authors.lastname: Nijboer
authors.forename: Iwan C C
authors.initials: IC
authors.lastname: van der Horst
authors.forename: Felix
authors.initials: F
authors.lastname: Zijlstra
authors.forename: Henk Jan
authors.initials: HJ
authors.lastname: Ten Duis
authors.forename: Maarten W N
authors.initials: MW
authors.lastname: Nijsten