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:2012 (59) Two cohorts; n 7,740 and 4,564 Physical activity and television watching 32 BMI- and obesity-related variants Th e genetic eff ects on BMI were stronger in those with low physical activity or longer hours of television watching Ahmad S, et al.
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