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:Pro-inflammatory cytokines can further impair synaptic plasticity by inhibiting production of neurotrophins like BDNF, inhibiting long-term potentiation, and altering the architecture of dendrites (Jurgens et al., 2012; Lynch, 2002; Milatovic et al., 2003; Richwine et al., 2008; Tong et al., 2008).
Category: