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:Exomes from each NSCLC patient were examined using FannsDB [16], FATHMM [16], Mutation Assessor [17], Polyphen [18], PROVEAN [19], and SIFT [20].
Category: