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. 2019 Sep 5;20:553. doi: 10.1186/s13063-019-3581-3

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© The Author(s). 2019

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. 1 — Observed components of selection criteria. Selection criteria that we applied in sources about gabapentin (a) and quetiapine (b). Shown are all possible combinations of selection criteria. Each of the three rings of the circle represents a different component of the selection criteria: numerical threshold, participant group, and difference in frequency threshold. Green text indicates selection criteria reported in public sources. All = all participants combined across groups; Any group = participants in a particular intervention group; Active = participants in the active intervention group (i.e., gabapentin or quetiapine).