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:…or live/dead assay (Bedaiwy et al., 2003, 2006; Martinez-Madrid et al., 2004; Arav et al., 2005; Courbiere et al., 2005, 2006; Imhof et al., 2006; Baudot et al., 2007), assays of apoptotic markers (Bedaiwy et al., 2003, 2006; Martinez-Madrid et al., 2007) and the cellcycle marker Ki67 as well as…
Category: