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 Autism Diagnostic Interview-Revised (ADI-R; Lord et al. 1994), the Autism Diagnostic Observation Schedule-G, Module 3 (ADOS-G; Lord et al. 2000)/Autism Diagnostic Observation Schedule-Second Edition, Module 3 (ADOS-2; Lord et al. 2012), and clinical judgment were used to establish ASD diagnoses.
Category: