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:MSH samples were genotyped using the Illumina 370K array; CSSCD samples were genotyped on the Illumina 610K array; HGDP samples were downloaded from the Illumina iControlDB database and were genotyped on the Illumina 650K array; European and African populations from the Illumina repository were genotyped on the Illumina 650K array; Saudi SW were genotyped on the Affymetrix GeneChip1 Human 250K Nsp array; Saudi patients from the Eastern Province were genotyped on the Illumina 610k array.
Category: