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. 2017 Oct 10;16:106. doi: 10.1186/s12940-017-0316-3

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© The Author(s). 2017

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. 3 — Illustration with standardized-b-coefficients of the longitudinal indirect paths of PCB to depressive symptoms through HVA/crea. Note: HPCB = higher-chlorinated PCBs, dioxin-like PCBs, HVA = homovanillic acid, t1 = measurement occasion 1, t2 measurement occasion 2; ⁺ = p < .10 (1-sided), * = p < .05 (1-sided)