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:Testosterone supplementation was able to reduce abdominal circumference and waist-hip ratio, and to improve insulin sensitivity and glycemic control in men with hypogonadism and type 2 diabetes mellitus (6,8,53,54).
Category: