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:1b), such as triglycerides, sphingomyelins and phosphatidylcholines, encompassing many lipids associated with risk for developing type II diabetes (Floegel et al. 2012; Rhee et al. 2011).
Category: