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:The recent boost of DNA “barcoding” in Madagascar (Nagy et al. 2012) and Korean (Jeong et al. 2013) herpetofauna and the formation of the “Cold Code” consortium (Murphy et al. 2013) for the global initiative to barcode amphibians and non-avian reptiles promoted COI gene as a recommended marker for…
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