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:In another study in the NHS and HPFS (59), we found that lifestyle factors closely related to energy expenditure, such as physical activity and television watching, also interacted with the genetic obesity risk score in relation to BMI, and stronger genetic eff ects were observed in those with low physical activity or more hours of television watching.
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