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:For example, previous work has suggested that FMD is significantly correlated with BMI [44] and indices of abdominal adiposity, such as waist-to-hip ratio [22] or visceral fat content [21,33].
Category: