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:Consequently, on the basis of these findings, the difference in thigmotaxis between the selectively bred HOFT and LOFT mice seemed to be a stable and robust feature of these animals, suggesting that the two lines differed with regard to trait anxiety rather than to state anxiety (see Belzung & Griebel, 2001; Lister, 1990).
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