title: Response.
authors.affiliation: Institute for Research in Extramural Medicine, The Netherlands. HCW.deVet@vumc.nl.
authors.forename: Henrica
authors.initials: H
authors.lastname: de Vet
authors.affiliation: Institute for Research in Extramural Medicine, The Netherlands.|Department of Epidemiology and Biostatistics, The Netherlands.
authors.forename: Herman J
authors.initials: HJ
authors.lastname: Adér
authors.affiliation: Institute for Research in Extramural Medicine, The Netherlands.
authors.forename: Caroline B
authors.initials: CB
authors.lastname: Terwee
authors.affiliation: Institute for Research in Extramural Medicine, The Netherlands.|Department of Medical Psychology, VU University Medical Center, Amsterdam, The Netherlands.
authors.forename: François
authors.initials: F
authors.lastname: Pouwer