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:This finding agrees with recent investigations that suggest that only a limited number of
The ISME Journal
bacterial species can drive major changes in the gut microbiota and, thus, influence the metabolic profile (Marcobal et al., 2013).
Category: