title: Letter to the Editor.
authors.affiliation: Department of General Practice, Erasmus Medical Centre, PO Box 2040, 3000 CA Rotterdam, The Netherlands. Electronic address: 362741bz@eur.nl.
authors.forename: Boris J
authors.initials: BJ
authors.lastname: Zwemstra
authors.affiliation: Department of General Practice, Erasmus Medical Centre, PO Box 2040, 3000 CA Rotterdam, The Netherlands. Electronic address: 340476jg@eur.nl.
authors.forename: Jeroen P
authors.initials: JP
authors.lastname: de Goffau
authors.affiliation: Department of General Practice, Erasmus Medical Centre, PO Box 2040, 3000 CA Rotterdam, The Netherlands. Electronic address: m.bohmer@erasmusmc.nl.
authors.forename: Mylène N
authors.initials: MN
authors.lastname: Böhmer