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:We studied 83 Zambian adults, chosen at random from a cohort study, who were fully representative of the population of a crowded shanty compound in Lusaka in which we previously analyzed small-intestinal architecture and function [18, 24].
Category: