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:Increasing evidence suggests that the CaSR, a G protein-coupled receptor, plays an important role in controlling divalent cation reabsorption in the renal tubule in health and disease (Riccardi & Brown, 2010; Riccardi & Kemp, 2012).
Category: