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:CARP has been found to be induced in cardiac ventricle overloaded by banding of the descending aorta (Aihara et al. 2000) and in skeletal muscle denervated by transection of the sciatic nerve (Baumeister et al. 1997; Tsukamoto et al. 2002).
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