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:This is consistent with previous reports that LY379268, at the same doses, failed to alter sweetened milk or sucrose intake (Baptista et al., 2004; Bossert et al., 2006b), suggesting that mGluR2/3s are not involved in natural (food, sex) reward.
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