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:…Spire1C KIND domain decreases ER-mitochondria overlaps Since ER tubules have been implicated in mitochondrial constriction and division (Friedman et al., 2011; Korobova et al., 2013; Murley et al., 2013; Korobova et al., 2014), we investigated whether Spire1C influences ER-mitochondria association.
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