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:Multiple studies have shown that specific phosphatidylcholines and sphingolipids levels, as well as the triglyceride profile are associated with relative risk for type II diabetes (Floegel et al. 2012; Rhee et al. 2011).
Category: