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. 2019 May 7;19:138. doi: 10.1186/s12888-019-2123-6

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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. 2 — Schedule of enrolment, interventions, and assessments. Legend: A = Adaptation phase: A short nature documentary was presented to familiarize participants with the laboratory setting and the method applied; E = Experimental phase: Participants were randomly assigned to one of three conditions. Times of measurements: t₀ = screening phase; t₁ = baseline measurement before watching any films; t₂ = after watching the nature documentary; t₃ = after watching the second film