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:These results are similar to a previous report [3] and suggest that mirror-image allodynia was successfully induced, although the degree of mirror-image allodynia was significantly smaller than the primary (ipsilateral) allodynia, as reported previously in the same rats [15].
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