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. 2016 Nov 14;6(11):e013728. doi: 10.1136/bmjopen-2016-013728

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Screening participation after the intervention (Interv.) of an added scheduled appointment to screen compared with controls (Control) receiving a standard open reminder. Results are stratified by screening centre (A) and age group (B). Participation is divided into screened as scheduled (blue) and screened by own separate appointment (red).