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:In different studies, CRPS patients perceive their affected limb to be larger than it really is [30,38] and have difficulties in deciding on the exact position and orientation of their limb, or on the laterality of pictured hands in limb laterality recognition tests [29,42,48].
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