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:All participants also completed Mindstreams (NeuroTrax Corp., New York, NY, USA), a computerized cognitive test battery designed to evaluate multiple cognitive domains (Dwolatzky et al. 2003; Springer et al. 2006; Yogev et al. 2005).
Category: