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In this paper by Berlin and colleagues (BMJ 2021;375:e65217, doi:10.1136/bmj-2021-065217, published 1 December 2021), the first sentence of the participants section in the abstract should have read “460 pregnant smokers aged at least 18 years who smoked ≥5 cigarettes/day or ≥3 roll-your-own cigarettes/day and had a pregnancy gestation of <18 weeks were randomised to a financial incentives group (n=231) or a control group (n=229).”
The article and PDF will be updated in due course.
