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:2% in those with TB meningitis and TB lymphadenopathy, respectively.(20,22) Of the 17 patients with ocular mycobacterial disease in this study, 13 had active disease limited to the eyes, 2 had systemic lymphadenopathy, 1 had miliary TB, and only 1 had active pulmonary TB.
Category: