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:In recent years, laparoscopy has become the gold-standard for the treatment of ovarian endometriotic cysts (Daniell et al., 1991; Donnez et al., 1996; Sutton et al., 1997; Yuen et al., 1997).
Category: