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:…the same dose range, produces significant anti-epileptic (Moldrich et al., 2001; Bond et al., 1999), anti-nociceptic (Simmons et al., 2002), and anti-addictive effects (Adewale et al., 2006; Baptista et al., 2004; Bossert et al., 2006b; Peters and Kalivas, 2006; Pfaus, 2009; Shimura et al., 1994).
Category: