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:…perceptions of the role of arts in health and well-being yielded only 54 relevant studies, four of which focused specifically on the salience of aesthetic and cultural issues in their lives (Caspari et al. 2011, Moss et al. 2012, O’Sullivan & Chard 2010, Reynolds & Prior 2011, Wikstrom 2004).
Category: