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:For nanotechnology and nano-foods, Siegrist et al. (2007) created a hypothetical model where Swiss consumer’s social trust (in nanotechnology producers) impacted perceptions of nanotechnology food information, which in turn fed into consumer benefit and risk perceptions, ultimately determining…
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