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:We identified four data collection approaches used among the 86 implementation research projects: (1) VA-wide databases built with extractions from local health-care facility data systems (35 projects), (2) local or remote extraction from local electronic health records (EHR) (59 projects), (3) collection of primary data directly from research subjects (55 projects), and (4) collection of data from non-VA databases (6 projects).
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