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:Since many aspects of gait and balance are influenced by dual tasking (O’Shea et al. 2002; Woollacott and Shumway-Cook 2002; Yogev et al. 2005), one could suggest that the left–right regulation of asymmetry also utilizes cognitive resources and hence will be altered during dual tasking conditions.
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