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:Basal Methabolic Rate (BMR), Daily Energy Expenditure (DEE), Training Energy Expenditure (TEE) of all subjects have been estimated, Metabolic equivalent (MET) of each dance for all subject have been evaluated by a Sensewear ArmBand metabolic holter as previously reported (Mafra et al., 2009).
Category: