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. 2016 Jul 29;16:662. doi: 10.1186/s12889-016-3351-z

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© The Author(s). 2016

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 — Conceptual framework of the hypothesized associations between the school-related factors of interest (in bold) and mental health difficulties (in italics) of students under consideration of various confounders (unformatted). Variables measured at school-level are denoted with an asterisk (*)