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:Other studies have found that GAD patients have a lower level of peripheral benzodiazepine receptors on their T lymphocytes [36], suggesting that benzodiazepines (which are antianxiety drugs) may also exert a regulatory effect on immune function [37].
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