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 this study, all coated NiTi wires showed more deflection with the unloading force than the loading force, which is consistent with previously reported
results (Lim et al., ’94; Krishnan and Kumar, 2004; Elayyan et al., 2008, 2010; Alavi and Hosseini, 2012; Wilkinson et al., 2012).
Category: