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:This may include looking for signs that are more prevalent in malignant cases, such as feeder vessels, gelatinous appearance and leukoplakia [Figure 1].[8,18] These signs as well as others could be used to help develop a diagnostic algorithm, as proposed by Nguena et al, to help clinicians identify OSSN and know when to appropriately refer for more specialized care.
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