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:Although considerable research had been devoted to unraveling biophysical properties of these individual GABAAR subtypes (Barnard et al. 1998; Mody and Pearce 2004; Okada et al. 2000; Ortinski et al. 2004; Sieghart and Sperk 2002; Vicini et al. 1986), less attention has been paid to whether a…
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