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:…between cognitive function (especially executive function) and certain aspects of gait (O’Shea et al. 2002; Woollacott and Shumway-Cook 2002; Yogev et al. 2005; Springer et al. 2006; Hausdorff et al. 2005; Bloem et al. 2001; Morris et al. 1996; Auriel et al. 2006; Van Wegen et al. 2006;…
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