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:‚Ä¶and MTR A2756G polymorphisms and risk of breast cancer, but the results of our study are consistent with those of previous studies (Cho et al., 2007; Larsson et al., 2007; Gao et al., 2009; Webb et al., 2011; de C√°ssia Carvalho Barbosa et al., 2012a, b; Lajin et al., 2012; Diakite et al., 2012).
Category: