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:Poultry, especially turkeys, are extremely sensitive to the toxic effects of AFB1 (Rawal et al., 2010a; Carnaghan et al., 1966; Arafa et al., 1981; Giambrone et al., 1985; Huff et al., 1986; Kubena et al., 1995; Klein
et al., 2000), which was first demonstrated when this mycotoxin was discovered as…
Category: