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:Originally, IC was performed on cytological smears and showed moderately accurate results.13,15‚Äì17 In recent years, several studies have reported comparable results for ThinPrep IC and IHC,9,10 with overall concordances of 97‚Äì99% for ER and 89‚Äì96% for PgR.9,10,17
 In this study, we confirmed the reliability of IC using the same fixation, antibody clones and dilutions in a large consecutive series of primary breast cancer
 cases.
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