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. 2019 May 14;42(2):115–124. doi: 10.1093/ejo/cjz034

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© The Author(s) 2019. Published by Oxford University Press on behalf of the European Orthodontic Society

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reproduction and distribution of the work, in any medium, provided the original work is not altered or transformed in any way, and that the work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 1. — Flowchart of the study selection process for the systematic review. *The same SR was used for CQ #3 and CQ #4; CQ: clinical question; SR: systematic review; RCT: randomized controlled trial; others: e.g. observational studies.