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. 2020 Feb 5;18:15. doi: 10.1186/s12916-019-1472-9

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© The Author(s). 2020

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Timing and duration of exposure to a smoking cessation pharmacotherapy in pregnancy. The beginning of each horizontal line indicates the date of dispensing and the length of the line represents the number of days covered by the dispensing. *LMP last menstrual period (estimated)