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:In order to improve ABM interventions and optimize symptom change, there has been a recent push to better understand the active ingredients and mechanisms that underlie post-ABM changes in symptoms (Beard 2011; Enock et al. 2014; Mogoaşe et al. 2014).
Category: