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:…the growth of not only Bifidobacteria, but also of strains belonging to the Bacteroidetes and Actinobacteria phyla, while
inhibiting Firmicutes strains (especially Clostridium) (Martinez et al., 2010), which is consistent with the presented results on the dietary fiber K1 and K2 preparations.
Category: