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:Given the known deWcits in cortical processing of prosody in children with ASD (Erwin et al. 1991; Wang et al. 2001; Kujala et al. 2005; Korpilahti et al. 2006), one may speculate that the disrup-
Category: