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:Our results showed that the frequencies of nodular hyperintensity on T2weighted images, nodular enhancement, and washout were significantly higher for locally recurrent HCCs than for successfully ablated lesions, as previous studies reported [5, 10].
Category: