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:A more formal study of incidence and the histology of the tumors need to be done, but these results suggest thatMuSKantibodies are not so infrequent in Chinese as previously reported in a study from Taiwan [5].
Category: