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 participants spoke several languages, including Spanish (Belalcazar-Bolaños et al. 2013a, b; Orozco-Arroyave et al. 2013a, b, 2014a, b, 2015b, 2016; Naranjo et al. 2016; Vásquez-Correa et al. 2015; VillaCanas et al. 2014), English (Arora et al. 2015; Aström and Koker 2011; Bakar et al. 2012;…
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