Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:In consistent with these results, the decreased activities of antioxidant enzymes were observed in rat liver (Fetoui et al., 2009), in rat kidney (Fetoui et al., 2010) and in fish liver (Oreochromis niloticus) (Piner and √úner, 2012).
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