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:We queried the MIMIC II 2.6 database (M. Saeed, 2011), which includes information from the EMR on 26,870 ICU patients at the Beth Israel Deaconess Medical Center (BIDMC) collected since 2001.
Category: