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:Pre-intervention survey data (n=65) was collected during the first week of class and postintervention survey data (n=65) the last week of class using the Mediterranean Diet Quality Index (KIDMED) developed and validated by SerraMajem et al.(10) The nutrition intervention was based on the MD as a weight management guideline and incorporated assigned readings, article reviews, recipe analysis, weekly discussion forums, asynchronous presentations, writing assignments, and exams.
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