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:EF was assessed using the Behavior Rating of Executive Function – SelfReport (BRIEF-SR; Guy et al. 2004), the Wisconsin Card Sorting Test Computerized Version 4 (WCST-CV4), and five computerized tasks: Go/No-Go, Anti-Saccade Arrows Task, Task Switching, the Flanker Task, and Shape Matching (Friedman and Miyake 2004; Nigg 2000; Rogers and Monsell 1995).
Category: