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 current results therefore extend previous studies that have reported discrepancies in pain perception following manipulated representations of the body (Ramachandran et al. 2009; Preston and Newport 2011) independent of the influence of pure response bias (Romano and Maravita 2014; Mancini et al.
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