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:…AD (Brown & Storandt, 2000; Carlesimo, Perri, & Caltagirone, 2011; Grober & Kawas, 1997; Grober, Hall, Lipton, et al., 2008; Mahieux et al., 2009; Sarazin et al., 2010; Vogel, Mortensen, Gade, & Waldemar, 2007) and aMCI (Ivanoiu et al., 2005; Saka, Mihci, Topcuoglu, & Balkan, 2006; Wagner et…
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