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:These criteria were assessed through parent and child interviews using the German version Kiddie-SADS-Present and Lifetime Version (K-SADS-PL, Version 1.0.; Kaufman et al., 1997) and an in-house health questionnaire.
Category: