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. 2017 Jan 31;7:4. doi: 10.1038/s41598-017-00034-w

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© The Author(s) 2017

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Funnel plot for the association between alcohol intake and the risk of DR in all the included studies. No significant publication bias was detected through pooling the 15 observational studies together.