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. 2018 Jan 25;8:313. doi: 10.3389/fpsyt.2017.00313

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Copyright © 2018 Fielenbach, Donkers, Spreen, Visser and Bogaerts.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Preferred Reporting Items for Systematic Reviews and Meta-Analyses flow diagram of selection of studies. Two articles included in the search results (44, 45) refer to the same study, so the flow chart does not count them twice.