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:To achieve such a vision we benefit from a national integrated system of community health services in which about 47 governmental medical science universities and their 400 affiliated research centers and research institutions are managed under the supervision of Ministry of Health and Medical Education (MOHME) (4-6).
Category: