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:These results differ from some other studies where the ALND group showed significant loss of shoulder range of motion compared to SLNB at 2‚Äì3 years of follow-up [14, 22, 40‚Äì42].
Category: