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:…(Bosco et al., 2006) and has already been used in many food systems including meat (Moller et al., 2003), fish oil (Pedersen et al., 2002), milk (Boubellouta and Dufour, 2008), cheese (Christensen et al., 2003), sugar (Bro, 1999), beer (Sikorska et al., 2008), red wine (Airado-Rodriguez et al.,…
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