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 is in close agreement with the histopathological findings in TSC, which has shown a disruption in normal cortical lamination, abnormal cell differentiation and reduction in density of myelinated fibers and number of normal neurons [22].
Category: