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. 2021 Aug 6;422:126848. doi: 10.1016/j.jhazmat.2021.126848

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Fig. 3 — Composition of phthalates in mask samples (the level ratios of the phthalates were obtained by first calculating the ratios of the individual phthalate for each mask sample and then calculating the average level ratios of each phthalate in all the mask samples).