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. 2020 Feb 17;17(3):323–331. doi: 10.1177/1740774520906398

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© The Author(s) 2020

This article is distributed under the terms of the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 2. — Number of articles by code provision, journal and journal’s code provision policy. Note that only articles published between 1 January 2013 and 31 December 2017 were reviewed, and data on journal policies were extracted on 22 October 2018.