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Letter
Reply: Immortal time bias in a retrospective study examining colorectal cancer mortality according to adherence to colonoscopy
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Contributors All authors equally contributed to data analysis and intepretation, and to the drafting of the manuscript. The final version was approved by all the authors.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.