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:During seven consecutive courses between 2008 and 2010, participants were asked to complete a paper-andpencil survey adapted from the recommended survey in the ASCRS/SAGES guidelines for a laparoscopic colectomy course [7].
Category: