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:Dominant and non-dominant breast categorisation was implemented by examining the magnitude of superioinferior breast displacement (the direction in which the greatest breast displacement occurred; Scurr et al., 2010) of each breast, within each participant, and assigning the breast with the greatest superioinferior displacement as the dominant breast and the least as the non-dominant breast.
Category: