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:(2010) 6(9) 1436 future science group Review Grotenhuis, Vermeulen & Kiemeney presence of visceral (lung, liver or bone) metastasis showing the most consistent results [24].
Category: