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. 2019 May 9;9(5):e026589. doi: 10.1136/bmjopen-2018-026589

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© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Gaps in research on the evaluation of interventions to improve adherence to RGs. Each circle represents one intervention. Variables displayed: (1) Circle size: number of studies evaluating each intervention (bigger=more studies); (2) Circle colour: study design of those studies (blue for RCTs and green for observational studies) and (3) Circle fill: kind of RG implementation (plain for checklist and stripes for bullet points and examples). Research gaps are highlighted in red. RCTs, randomised controlled trials; RGs, reporting guidelines.