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:Our finding supports the results of the earlier studies that the 5-HTTLPR polymorphism is associated with psychiatric disorders with a primary affective component (Contreras et al., 2010; Gressier et al.,2016; Buoli et al., 2016).
Category: