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:This can be readily observed when selection is artificially induced by forcing GC B cell-T follicular helper (Tfh) cell interactions (Gitlin et al., 2015; Gitlin et al., 2014; Victora et al., 2010), but is also likely to be at the origin of the ‘‘clonal bursts’’ that can lead to radical loss of clonal diversity in GCs under unmanipulated conditions (Tas et al.
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