Estimating the true effectiveness of smoking cessation interventions under variable comparator conditions : A systematic review and meta-regression

ACKNOWLEDGEMENTS This work was funded by Cancer Research UK (application number C50862/A18446). The systematic review protocol was previously peer-reviewed by Cancer Research UK as part of the funding process. The funder had no role in protocol design, decision to publish, or preparation of the manuscript. We thank the authors of included studies who responded to our requests for intervention material. We also thank the members of our advisory board panels who provided valuable input into the broader study design.Peer reviewedPublisher PD