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:This approach has been used in a range of clinical settings to develop practice (Coyer et al., 2007; Day et al., 2009; Kelly and Simpson, 2001) and to develop practitioner roles (Williamson et al., 2004).
Category: