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. 2016 Dec 10;13(12):1224. doi: 10.3390/ijerph13121224

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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The composition of PFAA compounds in soil samples from Shandong (SD), Sichuan (SC) and Liaoning (LN) provinces. The odd numbers represent the top soil and the even ones represent deep soil for SD and LN.