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:…study, it is
documented that body weight, clinical signs and micronucleus appearance did not differ in Vit E+Setreated broiler chicks when compared with the control group (Sharaf et al., 2009) which is also an indication that this amalgamation can assuage the noxious effects of CY more effectively.
Category: