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:Studies based on adherence to the ACS and/or the WCRF/AICR guidelines also reported that women who adhere to the guidelines were less likely to develop endometrial cancer, but these studies have also failed to provide evidence to suggest that lifestyle-related factors act jointly to influence risk of ovarian cancer [15, 17, 36].
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