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:These results are inconsistent with Se concentrations in individual tissues (Sevcikova et al. 2011), where groups supplemented with lactate-protein complex and Se-proteinate showed higher concentrations that groups supplemented with inorganic selenium.
Category: