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:All studies utilised different accelerometers; Compute Science Applications (CSA) accelerometer [5], SenseWear Armband [6], Caltrac accelerometer [7] and the ActiGraph [8], and positioned the device on multiple body positions; the hip [5], arm [6] and waist [7, 8].
Category: