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. 2015 Feb 13;15:49. doi: 10.1186/s12885-015-1042-2

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© Binazzi et al.; licensee BioMed Central. 2015

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Funnel plots of studies included in the meta-analysis for the risk of SNC associated with exposure to wood dust, leather dust, formaldehyde and textile industry. Note: Funnel plots can be easily interpreted by including diagonal lines representing the 95% confidence limits around the pooled estimate, to show the expected distribution of studies in the absence of heterogeneity or of selection bias: in the absence of heterogeneity, 95% of the studies should lie within the funnel defined by these straight lines.