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Correction: Typical use effectiveness of Natural Cycles: postmarket surveillance study investigating the impact of previous contraceptive choice on the risk of unintended pregnancy

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Bull J, Rowland S, Lundberg O, et al. Typical use effectiveness of Natural Cycles: postmarket surveillance study investigating the impact of previous contraceptive choice on the risk of unintended pregnancy. BMJ Open 2019;9:e026474. doi: 10.1136/bmjopen-2018-026474

This article was previously published with an error.

Under ‘Study Design’, the authors have stated, ‘We did not include any data from menstrual cycles that started after 28th February 2017’.

The correct sentence is as follows:

‘We did not include any data from menstrual cycles that started after 28th February 2018’.

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