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:A recent report (Teixeira et al. 2007) corroborated some of the previous observations and found that the o/w microemulsion was effective in reducing the cell numbers and preformed biofilms of five food-borne pathogens but lost all antimicrobial properties when diluted by the addition of water due‚Äö√Ñ¬∂
Category: