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:For the wild-type mice, our results were in line with previous studies (Brose et al. 2016, Bazinet et al. 2005, Trepanier et al. 2017) such that CO2-induced increases
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