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:These results are in accordance with the findings of Kambylafkas et al. (2006), who concluded that the use of the panoramic radiograph for evaluation of total ramal height is reliable and an asymmetry of more than 6 per cent is an indication of a true asymmetry.
Category: