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:Several terms have been used to describe vestibular symptoms occurring with migraine, including: vestibular migraine, migrainous vertigo, migraine-associated vertigo, migraine-associated balance disturbance, and benign paroxysmal vertigo [1,7].
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