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:Identification of consensus driver genes Framing the stage of tumor as the unit of analysis, we used the following tools to identify driver genes: ActiveDriver[8], Dendrix[9], MDPFinder[10], Simon[11], Netbox[12], OncodriveFM [13], MutSigCV [14], and MEMo [15].
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