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:It was rolled out nationally in 2006 with funding of €55 million, after being successfully piloted in a small number of locations between 2001 and 2004 (Timonen 2004, Timonen et al. 2006b).
Category: