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 were consistent with the findings in the literature that visual impairment is common among patients in rehabilitation facilities (Cox et al., 2005; Grue et al., 2009; Lieberman et al., 2004; Lotery et al., 2000; Park et al., 2005; Squirrell et al., 2005; Wainapel et al., 1989).
Category: