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:GIS is increasingly being used in developing countries in order to examine potential access to health facilities and to plan the location of new treatment centres, for example, in relation to treating malaria [71, 83], tuberculosis [95] , access to HIV treatment [94], planning public mental health and cancer resources [7, 72, 84] and to examine attendance patterns at rural clinics [91].
Category: