title: The effect of a direct payment or a lottery on questionnaire response rates: a randomised controlled trial.
authors.affiliation: Seven Brooks Medical Centre, Atherton.
authors.forename: P J
authors.initials: PJ
authors.lastname: Roberts
authors.forename: C
authors.initials: C
authors.lastname: Roberts
authors.forename: B
authors.initials: B
authors.lastname: Sibbald
authors.forename: D J
authors.initials: DJ
authors.lastname: Torgerson
mesh_terms: D000328:Adult; D000368:Aged; D004739:England; D005260:Female; D006306:Health Surveys; D006801:Humans; D008593:Menopause; D008875:Middle Aged; D016017:Odds Ratio; D012201:Reward; D011795:Surveys and Questionnaires