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:Fuchs endothelial corneal dystrophy (FECD; OMIM 136800) is a slowly progressive late-onset disorder that is a leading indication for corneal transplantation in the United States [1,2].
Category: