title: Are validated questionnaires valid?
authors.forename: Bruce D
authors.initials: BD
authors.lastname: Beynnon
authors.forename: Ewa
authors.initials: E
authors.lastname: Roos
authors.forename: Stefan
authors.initials: S
authors.lastname: Lohmander
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Johnson
mesh_terms: D017063:Outcome Assessment, Health Care; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*