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 resected specimens were classified as either low-grade mucinous carcinoma peritonei or high-grade mucinous carcinoma peritonei on pathologic evaluation by experienced peritoneal malignancy pathologist.(8) Postoperative complications were classified according to the Clavien– Dindo classification.
Category: