Thom Bongaerts

93 Attendance characteristics of the breast and colorectal CSPs Acknowledgements The authors wish to thank the national screening organisation, region South-West (Bevolkingsonderzoek Zuid-West) for providing data on screening examination, and the registration team of the Netherlands Comprehensive Cancer Organisation (IKNL) for the collection of data for the Netherlands Cancer Registry. (Since 1 January 2022, the 5 regional screening organizations merged into 1 organization: Bevolkingsonderzoek Nederland). Contributions THGB and FLB designed the study, collected, and combined the datasets. Data analysis was undertaken by THGB, supervised by FLB, and in a later stage by LdM and MAGE. THGB drafted the first version of the paper. ORG and MEN helped to interpret the results. All authors reviewed and edited the manuscript. Funding: None declared. Competing interests: None declared. Patient consent for publication: Not required. Data sharing statement: The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request. Ethics approval statement: On forehand the Ethics Committee of the Leiden University Medical Centre issued a waiver of consent (G18.096). 3

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