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:These polyphenols and other components have been described as having antioxidant (5), pro-oxidant (6), tumor inhibitory (7,8), antiapoptotic (9), antiangiogenesis (10,11), antiestrogenic (12,13), epigenetic (14), and other potentially chemopreventive properties (1,3,4,15,16).
Category: