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 results replicate and extend previous results from our lab (Hankosky et al., 2013), demonstrating distinct manifestations of behavioral sensitization in adolescent- and adultexposed rats that only emerge if the challenge dose is high enough (i.
Category: