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:The adaptation process consisted of the following steps: (1) focus group discussions to adapt the language of a depression screening instrument (the PHQ-9) (previously described) [14]; (2) a validation study to determine the test characteristics of the PHQ-9 among HIV-infected patients in Cameroon (previously described) [14]; (3) key informant interviews with a variety of health care providers to define the existing (preintervention) standard of care for patients presenting with mental health disorders; (4) adaptation of medication and dosing recommendations in consultation with local medical
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