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:A number of key characteristics that have previously been studied in relation to supporting alcohol tax increases (Latimer et al., 2001) were then examined through multivariate logistic regression analysis, with two separate models run to identify predictors of supporting price increases on beer and on spirits.
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