title: Completing questionnaires by proxy.
authors.forename: B G
authors.initials: BG
authors.lastname: Kolnaar
authors.forename: H J
authors.initials: HJ
authors.lastname: van den Hoogen
authors.forename: C
authors.initials: C
authors.lastname: van Weel
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D006801:Humans; D008487:Medical History Taking / Q000379:methods*; D009017:Morbidity; D009426:Netherlands / Q000453:epidemiology; D015995:Prevalence; D012140:Respiratory Tract Diseases / Q000453:epidemiology*; D011795:Surveys and Questionnaires