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:While azoospermia is common in males with isodicentric Y chromosome, our understanding of the cause of spermatogenic failure is clear only for those idic Yp patients with breakpoints that occur along the Yq and typically result in AZF deletion and/or recombination [12, 13].
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