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:…reportedly have bacterial activity which could justify their relevance in treatment of TB. Fabaceae, Asteraceae and Rutaceae families have also been mentioned by several authors to be most used by local communities (Ugulu et al., 2009; Ssegawa and Kasenene, 2007; Yineger and Yewhalaw, 2007).
Category: