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Perez Chacon G, Estcourt MJ, Totterdell J, et al. OPTIMUM study protocol: an adaptive randomised controlled trial of a mixed whole-cell/acellular pertussis vaccine schedule. BMJ Open 2020;10:e042838. doi: 10.1136/bmjopen-2020-042838
This article was previously published with an error.
Few errors on the visit schedule in figures 1 and 2 were fixed.
Below changes have been made in figure 1:
Visit 2: 4 to <5 months (instead of weeks)
Visit 3: 6 to <7 months (instead of weeks)
Visit 6: 12 to <18 months (instead of weeks)
Visit 7: 18 to <19 months (instead of weeks)
Below changes have been made in figure 2:
Visit 2: it is clarified that the vaccines will be given by a local immunisation provider
Visit 3: 18 to <19 months (instead of weeks)
OFC: ≥12 to <18 months (instead of >12)