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:ADIPOR2 mRNA levels correlated positively and independently only with fasting triglyceride concentrations [49], whereas ADIPOR1 mRNA expression was positively correlated with serum insulin and C-peptide concentrations, first-phase insulin secretion, and elevated plasma triglyceride and cholesterol concentrations [49].
Category: