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 also evaluated the quality of each study based on the Methodological Evaluation of Observational Research (MORE)- Observational Studies of Incidence or Prevalence of Chronic Diseases developed by the Agency for Healthcare Research and Quality (AHRQ) [14].
Category: