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:Several authors have questioned the stripping procedure as it may be associated with excision of ovarian tissue adherent to the cyst wall, with consequent loss of follicles (Brosens et al., 1996; Donnez et al., 1996).
Category: