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:Longini et al. (2004) used values that were similar to these estimates in a stochastic simulation model of pandemic influenza to show that the targeted use of oseltamivir in close contact groups could slow the transmission of influenza on the community level.
Category: