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:The point probe for fluorescence and reflectance spectroscopy was also evaluated in a Phase II study on a similar number of tissue specimens—and these results were comparable to those obtained by other groups.(54,55,74,75) This investigation helped to identify the causes of measurement variability in the clinical setting (eg, differences in menopausal status), giving information essential for developing effective downstream normalization and analytical approaches.
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