Correction
The title of the original publication [1] had an error; furthermore there were errors in Fig. 2. The corrected version of the title and of Fig. 2 (Additional file 1 here) can be found below in this Erratum.
Incorrect title:
Reduced nicotine content cigarettes in smokers of low socioeconomic status: study protocol for a randomized control trial
Correct title:
Reduced nicotine content cigarettes in smokers of low socioeconomic status: study protocol for a randomized controlled trial
Error in Fig. 2:
The study week and study day numbers at the top of the figure should match up with the numbers at the bottom of the figure.
Reference
Krebs NM. Reduced nicotine content cigarettes in smokers of low socioeconomic status: study protocol for a randomized control trial. Trials. 2017;18:300. https://doi.org/10.1186/s13063-017-2038-9
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The online version of the original article can be found under doi:10.1186/s13063-017-2356-y
The original article can be found online at https://doi.org/10.1186/s13063-017-2038-9.
Additional file
Additional file 1:
SPIRIT figure. (DOCX 48 kb)
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Krebs, N.M., Allen, S.I., Veldheer, S. et al. Correction to Reduced nicotine content cigarettes in smokers of low socioeconomic status: study protocol for a randomized control trial. Trials 18, 598 (2017). https://doi.org/10.1186/s13063-017-2356-y
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DOI: https://doi.org/10.1186/s13063-017-2356-y